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Snape tipped off the Death Eaters to the real time they were moving Harry - How did he know?
Snape uses the Imperius curse on Mundangus to get him to think of the plan. Snape does not let Voldemort know that there would be multiple Harry Potters.
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Snape is with the Death Eaters chasing the 7 Harrys out of Privet Place. He used Sectumsempra on George. He sat there while V murdered the Muggle Studies teacher and let the Carrows do their thing at Hogwarts. So....while I get that he was acting as a double agent for Dumbledore due to his love for Lily, he was still a pretty bad guy. Seems odd that Harry names his son for him later.
He hurts George on accident. He was trying to hit another Death Eater and mistakenly hit him.
There wasn't much he could do for the Muggle Studies teacher at that point.
If you remember, he would send the "bad" kids out to do "hard time" with Hagrid. He did what he could to shelter the kids, without drawing attention to himself.
Remember he also sent the sword to Harry and did what he could to protect the students.