"So we were right, it is the Sorcerer's Stone, and Snape's trying to force Quirrell to help him get it. He asked if he knew how to get past Fluffy, and he said something about Quirrell's "hocus pocus. I reckon there are other things guarding the stone apart from Fluffy, loads of enchantments, probably, and Quirrell would have done some anti-Dark Arts spell that Snape needs to break through" Henry said as if he had worked out the hardest problem ever, it took everything Harry had to not snort out loud.