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Mastermind (possibly) gets frozen in place if he grabs someone the exact moment they escape.
I got grabbed by his M2 power the exact moment I escaped via a gate and a glitchy animation ensued. Wesker looked like he was completely unable to move behind me during the running away animation as you escape. I spectated the last survivor who was in the match and Wesker didn't seem to wanna go find him, so I don't know for sure if he was either actually stuck in place, afk, or camping the exit gate. In the postgame chat the last survivor said didn't even know Wesker was frozen because they were crawling to the hatch. The killer wasn't talking in the chat so we don't know what happened on their end either. Here's a clip:
I'll post the logs too but I played a match or two after I got this clip so you'll probably have to look a bit further down the log file until you find the actual moment this happened.