system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter and the Sorcerer's Stone] Why does Voldemort still trust Snape after he repeatedly tried to stop Professor Quirrell/Voldemort?
gpt
Snape was working against Quirrel. They never said "hey it's me ur master Voldemort", so he thought there was just dark-wizard wannabe Quirrel trying to steal the Philosopher's Stone. And he had to keep working for Dumbledore just as if he was loyal, until commanded by Voldemort not to.