Halls of Atonement Gargoyles bug

Gargoyle bricked a 13 halls I was in. We went down after 1st shard and were on 2nd shard when the gargoyle randomly pulled with no one around. It was an immediate wipe as it brought the houndmaster with it. We then went down the stairs to ensure it did not pull again and were in the middle of the courtyard when it ran over from 100 yards out and aggrod.