>This is because, in theory, by playing tetris and changing the layout of the dungeon, eventually you may create a path for the knight
Ohh, I hadn't realized it but I guess that makes sense. I've had situations where the knight was walled on all 4 sides, like being stuck on a one-tile island with nowhere to walk (and no action points). But, if you drop a tetris piece with an unwalled edge next to the knight, would the spot you're stuck in open up to accomodate the new piece? In that case it would indeed be possible to un-stick yourself.
>I can't be sure this is what you're talking about, but maybe the knight wouldn't move because he was out of Action Points?
Nah it wasn't this; there was no animation or anything. I feel like it happened when I was playing quickly, like if I move a tetromino around, walk one step, press fast fall, walk another step, etc. Like if a coroutine got stuck/cancelled somewhere. I should also note that I was playing on a controller though.