This scenario wasn't really me just strolling off. We got attacked by a group of wolfs, and I expected the party to follow me, but then they started doing other things. (Like the alchemist went on a quick search of alchemical components instead, and the other 2 party members went back to sleep or something.) When they said they weren't following me, thats when I decided to go by myself.
We were actually out in the forest looking for some missing merchant wagons. For the lootz. I went off to see if these wolfs might be the cause of the wagons going missing. But nobody followed.
Ok well with that information, I guess what I would have done is award the full unadjusted 800 xp (but to the whole party). The reason I would, is to encourage outside the box thinking because I think the strategy you used was awesome and the possibility of play like that is one of the reasons tabletop rpg are so great. But the way he did it is not so bad, give him a little leeway. He might have written right in his pre-written notes "sleeping dire wolf, CR2" or heck that might have been even written in a pre-written module he was using. That's really not unheard of to adjust the CR because of circumstance or environment that make it less or more difficult than encountering the creature normally.
Come to think of it, what matter more than the XP is this... was it a high five moment at the table when you basically solo'd a dire wolf with wits alone? Because that would be high fives all around at my table I bet if someone did that.