That blasted Quirrel!!! I know he's trying to get that stone now. But why play that bloody trick with the dog? Unless... He's challenging me. That's got to be it, he knows something I don't and is having fun playing games with me.
I will not let myself be toyed with like that. At least Fluffy as Hagrid calls him almost got him too. That should delay his plan for a little. I mustn't tell Dumbledore, first of all the rest of the staff will suspect me as trying to get it myself and secondly, this is my own battle. Between me and Quirrel, between being stuck in potions and earning the Defence against the Dark Arts position.
Potter saw my leg though, at least he won't connect it with anything. Hopefully he'll pin it down to something vile I'm hiding in the dungeon rather than it's true source.
Now, back to formulating a plan....