If they're raiding, won't they be pissed at you for torrenting and slowing the connection to crap?
That's the point. His housemates canceled on the plans to go out so they could raid instead, so he's pissed at them, so he's going to torrent as much as possible to fuck up their raid.
*Edit* - Also, my plans were originally to sit around and play videogames while my fiancee was hanging out with her friends (I too dislike large groups, especially large groups of people I don't know well), but then some of my good friends from undergrad decided to get together, so I'm doing that instead. We're not going out though, just over to one of their apartments, and there will be like 5 people there including me.