Being doorcrushed creates a honest-to-God invisible forcefield around you
Created by: 9600bauds
https://github.com/d3athrow/vgstation13/blob/465fb8b5b5a00f8697e2e47ce3b02f4ce0bc85bb/code/defines/obj.dm#L339 https://github.com/d3athrow/vgstation13/blob/0dc86433b7dbee2307b6c0113d7e91ff3a90f556/code/game/machinery/doors/airlock.dm#L1291 When getting doorcrushed, a mob spawns a magical "stop" forcefield to hold it in place. For some context, the only other things that use this "stop" forcefield are timestop, and an admin player panel punishment.
For as long as the forcefield is around you, NOTHING MAY MOVE YOU OFF THAT TILE (edit: except with very good timing).
This means nobody may drag you off the door to stop the doorcrush (edit: except with very good timing). The pull will inexplicably break while you remain in place with no indication of why (edit: except with very good timing).
This also means that if you are immune to the stun of the doorcrush itself, such as by being a horrorform ling, you will be perfectly standing up yet unable to move. You can turn around, attack anything close enough to you, throw items etc etc. you just may not ever move out of the tile. whoops it turns out that airlocks are FUCKING MAGIC and one of the two things I could find in the game that manage to stun horrorform lings isn't that wonderful
The forcefield lasts for 2 seconds, though obviously it's trivial for anyone doorcrushing you to just keep doorcrushing you which extends the forcefield indefinitely. Hell if someone made an assembly to continuously doorcrush they couldn't even get your corpse off of the tile (edit: except with very good timing).
Why the fuck does this exist?