Specifically this player was abusing a Doorman bug where you could be transported into Rem's tunnels/under the map. Only way out was to F7 -> killme command.
Player has been reported in both DL and steam.
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This game truly is just bad. Every time I play it's just a shit stomp. Maybe 1 in 25 matches is an actually decent game. Literally googling "deadlock game matchmaking" and the AI response always mentions the "controversial matchmaking" reputation Deadlock - an alpha...