The guy does seem very happy to jump on any reason to kill someone. I'd like to mention he pulled the exact same thing on me, I killed him one round and the next round, 20 seconds in, he blasted me away citing "I shot at him" or something along the lines (When I was in a steam chat anyways, not even in game). But maybe I did shoot, I'm not sure. I don't know why I would and I have no recollection of it, but I never checked shot logs so whadunnyano.
x6