As everyone knows, gameplay on Dust2 DM gets frantic when the server is full-ish. If you see someone and don't shoot, you'll usually be dead in 0.01 seconds. Less if it's Delta.
So I saw a red guy in my peripheral vision, spun around and unloaded, and only afterwards learned that he/she was actually knifing with button. It was all over by the time I could figure out what weapons they had out.
She was understandably pissed off, and I responded with flippant dismissal. That was a dick move and I'm sorry.