When Remus spit on the floor I was practically pumping my fist going "YES! Go Remus!" You know, for at least some of us, there's this period after you get out of high school where at first you don't want to let go of your friends and attachments, but then you slowly realize "My God, what a bunch of fuckheads!" You are describing that sordid process so damn well!
Oh and the bite? Brilliant! I know I said it before, but I love your Remus here. He's got that very Piscean personality of "I hate confrontation, I want to be a nice guy, but you are pushing me to my limit... ahh, there it went! Snap CHOMP rawr!"