Stage 5 of the John Van Caneghem Tournament

I just don't understand why the Dungeon creatures run around in a group, all to one side or the other. Why can't they surround the enemy from both sides? It seems strange.

Goblins have twice the initiative, and they manage to wait first, and then move to a position that is out of reach for the Dungeon creatures (and if, for example, Furies were in their place, they would have time to attack three times before the Dungeon creatures even get their turn).

As for fire traps, some people (on other forums) consider them to be overpowered (a very effective spell that can be used to do amazing things) and have banned the use of this spell in tournaments, but it is not banned on this site.