This happened me 2 times today (3 times total), when a mob is very close to a wall (usually in cave levels, where walls aren't always 90 degree from the floor) and you're using Deft srtrike to teleport behind the mob, you'll find yourself stuck in the wall, and then only 2 things you can do is kill yourself with the /killme command or if you're lucky enough to have another mob outside the wall then you can teleport out with another Deft strike.
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