Why would someone do this?

[sabshupe101]

I was on skype with my friend, and he added 2 of his friends to the call and I figured I ought to trust them because we were talking on skype and he was friends with my friend. So when we were the last 4 tributes left, my friend's friend kicked us out of the call and killed us. <---BTW guys, it was wobbie333 (on his original accoutn), and I avenged myself so much He's honestly not that good...