Not sure what’s going on, but I just tried leading a pair of mi-gos into a minefield. One of them lagged behind, after getting distracted by something, but the second one followed me into the minefield, only to get ‘stuck’ at the point where it should have stepped on a mine. I had already mapped the minefield out, so I could see where the mines were, but once it got to the file next to a mine, the mi-go just stood there, doing nothing. I let several turns pass, but still it didn’t move, and so I just walked over and shot it with my rifle. I haven’t noticed this problem with any other monsters, which I often have great fun with, letting them loose in minefields… 