I dont know if its a bug or a intended feature tbh, but when you freeze enemy, you can push it even if its a large one or a boss, and in the Crucible it leads to easy abuse of this mechanic because you can freeze Cyvion right near the edge and just push him out, even during 1st phase, so you can kill him instantly without even going into 2nd phase (tbf even without that freeze ailment is very strong because of its duration and you can kill boss without pushing him).
So my suggestion is either make it so bosses couldnt be pushed during frozen state or make arena for Crucible boss be without gaps on the side so none of us couldnt fall out.