*talking to self* Take some deeeeeep breaths, Audrey. Calm...Calm....Caaaaalm...Don't strangle...No killing...It's against forum policy...
Ok...
NO, I don't believe Snape was spoiling for a fight. Did you notice the way he moved, and the place he moved to? His gait was "twitchy", and he had his head down (reading exam paper). A lowered head is generally know as submissive, and not aggressive. And he later moves toward the bushes. This indicates that he does not want to sit anywhere exposed. He wants whatever physical "walls" he can find. This is why introverts and people who have been bullied seek the corner of a room. Their back is not exposed to enemy attacks.
And if he was spying, that still doesn't mean he was looking for what he got. Though Snape does not know it at the time, the marauders have been running loose with a werewolf (very dangerous to anyone out at night...like Hagrid!?). If they were caught, so what? It would be good, since no one would be in danger of being bitten.
Plus, even if Snape was spying, since when is the accepted punishment for nosiness soap-in-the-mouth and public pantsing?
Now onto the greener pastures of Lily/James...^^;
Or maybe not so green...
Aw, sweet. What a gentleman.
(SWM- Audrey's hot spot

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