Ritual and Stone Statues

In endgame sometimes the Stone statues count as mobs to be killed by the ritual activity in endgame. The problem is that some stone statues are invulnerable and wont activate during the ritual making it impossible to finish. I had the tornado thing following me while i had to kill those thiongs but i couldnt damage them at all nor where the moving. Same bug with bridges and strong boxes where minions somehow land below the bridge and cant be killed.