Do you get any script errors when it happens? If you do, could you open the console and take a screenshot? You may have to enable the developer console in your game settings.
Uh, I'll see if I can scroll up and find the script error. It was a while ago though. For more info @Verified the victim had some weird symbols in his name, he filed 2 reports, both of which I couldn't view and they had the round "?" Edit: I'll have to view the demo for the script error, it's no longer in my console. Might do it later if you need it.
The script error would help us find exactly where it occurred, but your description already gives me a pretty good idea of what's going on. Thanks!