I've killed 1 or 2 teammates because of it. When the screen comes up, any weapon in the ready/fire position automatically goes off. So, someone runs up to help a teammate, ready to swing. The teammate gets the kill just as the other get there, and because it was the last kill, he cannot stop his attack from swinging. I've seen that happen a lot since the patch. Say I have my crossbow readied as I watch the last guy fighting. If he gives me a chance, I'll take the shot. Instead, a teammate kills him and stands on his body. The screen comes up and I end up shooting him. That has happened, and I felt terrible because it was out of my control.