BB chessboard bug
 

Mucking around at BB chessboard with charm, I noticed if I sent my pet towards the mob that spawns in the western corner, it could get stuck in the fallen chess piece near the mob. This made the mob rub away towards the eastern wall and disappear, and my pet would just stand there. When I hit invis, both mobs would come after me from the western spawn point.

I hope this makes sense.