Did Snape really want Harry expelled?

Professor Snape doesn’t really want Harry expelled, except maybe as a sort of vague wish about never seeing Potter’s spawn again. However, Snape understands perfectly well that Hogwarts is one of the safest places for Harry to be at, and he is devoted to Harry’s safety.

Did Snape know Harry was in Hogwarts?

No. Snape never knew, and it is important for the narrative that Snape didn’t know. Snape initially only decides to protect Harry, and work against Voldemort, because Harry is the last remnant of Lily, he hadn’t yet come around to fighting Voldemort, because Voldemort is evil.

Who cast the Patronus that lead Harry to the sword?

Snape
Yet despite the danger of his mission, and despite being hated by most of the wizarding world, Snape held on to the one thing that kept him going: the safety of Lily’s son. He even sent his Patronus to guide Harry Potter to the sword of Gryffindor (a known Horcrux-killer) in a nearby lake.

Why did Hermione run to Harry’s rescue from Snape?

Meanwhile, Hermione noticed Professor Snape muttering with his eyes fixed on Gryffindor’s Seeker and, being Hermione, put two and two together. Being well-read on the subject of curses (and every other subject, for that matter), she thought Snape was jinxing the broom and ran to Harry’s rescue with her fiery spell.

How did Harry Potter get knocked off the Nimbus Two thousand?

Harry had a close call during his first Quidditch match when his Nimbus Two Thousand started a strange impromptu dance trying to knock him off. Meanwhile, Hermione noticed Professor Snape muttering with his eyes fixed on Gryffindor’s Seeker and, being Hermione, put two and two together.

How does Snape locate Harry Potter?

Depending on how the Patronus charm works, Snape has at least one method of locating Harry. As we have seen in several instances, the Weasley wedding and Harry’s return to Hogwarts, the Patronus Charm can be used to deliver messages. In this case, the spirit guardian flies off toward the intended recipient.

What did Harry learn from Slughorn and Snape?

Harry did learn that Snape risked a lot to secretly help Harry throughout his adventures, but Snape was still a total jerk to him. Slughorn might have been materialistic, but at least he still fought against Voldemort in the Battle of Hogwarts.