Monster stuck on darkshrine in Merci Lab

Hey,

I found a monster stuck on a darkshrine in merci lab. I was able to hit them with spells (didnt check melee), but they couldnt hit or target me unless I was in melee range. I could click the darkshrine to gain the buff. I think there were about 4 minions with the stuck elite, all of which could move normally.

Cheers,

David