Harry travelled to the far side of the lake to watch. He saw the Dementors descending upon Sirius and his past self. Realising that no one was coming, Harry stepped forward and cast his Patronus. A stag erupted from his wand, and it drove off the Dementors.
During the attack Harry Potter attempted to defend himself, Hermione, and Sirius with a Patronus Charm, but failed due to the sheer amount of Dementors. However, he and the others were saved by his future self, who had travelled back in time using Hermione's Time-Turner.
It was Harry both times. I'm pretty sure you can clearly see Harry casting the patronus second time. Harry's patronus is a stag, Snape's one is doe. The "always" scene was Snape demonstrating his love for Lily to Dumbledore.
In 1993, Sirius Black escaped from Azkaban after seeing Scabbers in a Daily Prophet article of the paper Cornelius Fudge gave him in late July 1993, recognising him as his traitorous former friend Peter Pettigrew.
Moreover, he was forced out of his animal form, a not so easy feat, which in case of Pettigrew a little earlier, had required the combined magical might of Sirius and Lupin. It cannot be that Dementors always have this prowess, since Sirius is the man who escaped Azkaban using his Animagus form.
Harry's godfather Sirius Black endured 12 years in solitary confinement in Azkaban for a crime he did not commit. By focusing on his innocence he was able to survive and escape the merciless Dementors, and would later narrowly avoid the Dementors' Kiss with help from his godson.
As an Animagus, Sirius turned himself into a large black dog. Sirius' Patronus probably took the same form as he had an affinity with the animal. We know that James Potter turned into a stag as an Animagus and that his Patronus was also a stag.
He saw the Dementors descending upon Sirius and his past self. Realising that no one was coming, Harry stepped forward and cast his Patronus. A stag erupted from his wand, and it drove off the Dementors.
Sirius, an unregistered Animagus, escaped Azkaban prison by transforming into his dog form, slipping past the Dementors that were unable to detect his canine guise. Though clever, it was twelve years before Sirius utilized this method to escape.
1 Lupin Believed Sirius Was Guilty
He believed this throughout Prisoner of Azkaban, only understanding he was innocent when he saw Peter Pettigrew on the Marauder's Map.
If you can see/feel what your Patronus sees/feels when you send it off on a mission, Snape would know the moment the Patronus found Harry and would be able to hide the sword in the lake in time for Harry to find it when he arrived, minutes later.
A Dementor attempting a kiss on Sirius is witnessed in the film adaptation of Harry Potter and the Prisoner of Azkaban, in which his soul is being sucked out his mouth in the form of a small, glowing, white dot, but the Dementors are fought off by Harry's Patronus before they can finish this.
Coincidentally, the Patronus of Harry's future wife, Ginny, was a horse. James Potter's Patronus was the same form as his Animagus.
Obviously Dumbledore didn't know Sirius was innocent. None of PoA would have made sense if Dumbledore didn't actually believe that there was a mad man on the loose trying to kill Harry. Yet some people think Dumbledore knew Sirius wasn't the secret keeper but wanted to let him rot anyways.
Lily Potter's magic all comes down to love and affection. Her greatest strength is her heart. This is the only way that Harry was protected from a killing curse, because of the love of his mother. As can be imagined therefore, he Patronus is incredibly powerful because it is created with all of that love and happiness.
Now, come to Snape's mind: He knew that the sword was definitely important because Dumbledore wanted him to deliver it to Harry. Death Eaters could easily suspect that the sword was important because of previously given reasons and they could appropriate it directly from his office.
MASS BREAKOUT FROM AZKABAN was a Daily Prophet article about the 1996 mass breakout from Azkaban, in which ten Death Eaters, including Bellatrix Lestrange, Antonin Dolohov, and Augustus Rookwood, were able to break out of their cells with the help of the Dementor guards, who had switched sides and were following Lord ...
Every fan of the Harry Potter series is familiar with the Marauder's Map. This map, created by James Potter, Sirius Black, Remus Lupin, and Peter Pettigrew, fell into the hands of Harry Potter in Harry Potter and the Prisoner of Azkaban.
The one his Gran bought for him after she was proud of him battling it out at the ministry did. Last one Ollivander made before being taken by the DE, IIRC. As far as Voldemort's wand, I think Ms. Rowling said that Pettigrew took it back after the failed attack and kept it for him to curry favor.
As noted on Pottermore, the shape of Ginny's Patronus has a small connection to that of her future husband's. When Harry first sees his corporeal stag Patronus across the lake in "Prisoner of Azkaban," he thinks it looks like a horse.
Dumbledore already knew about Hermiones' Time Turner. Dumbledore loves Hagrid and we can very easily say that he was against the execution of buckbeak regardless of his feelings for Hagrid anyway.
Harry and Hermione need to save Buckbeak without being seen. But the other thems are inside Hagrid's hut, not leaving. Hermione throws a rock at other Harry's head to draw his attention to the Minister's arrival.
Sirius Black's boggart was himself, yet with subtle changes. A black cloak over his head, the dark mark proudly displayed on his pale skin and a malicious smirk gracing his lips. He feared becoming the future his parents desired of him. , Read all the Harry Potter books.
1. Albatross. As the rarest Patronus possible, the Albatross represents an enormous bird that flies freely across any sea. This Patronus represents those who are simultaneously fearless, optimistic, happy-go-lucky, and ambitious.
With that done with, Dumbledore successfully convinced the Ministry that Sirius was innocent all along and managed to get him cleared of all charges posthumously.