A luggage cart hitting the edge frame of a door will send the victim behind the door. This is really infuriating as it will commonly get people stuck in a wall, or away from your guardian/walker, or have some sort of weird interaction happen with the person being carted.
https://forums.playdeadlock.com/categories/hero-gameplay.5/
Either way, turrets are countered through AOE spells or playing around areas away from established McGinnis death zones. If you're getting devastated by mystic slow, you can counter it with enduring speed like what you might do against...
A door position that can force Doorman through the geometry and into the void. Probably not very applicable outside escapes or cheeky door setups if they can escape w/o unstuck.