By estimating the amount of remaining, unburnt equipment of the pitiful victims being scattered around on the ground, it became apparent that this place really was an underground ruin that hadn’t had its treasures robbed yet.
“Well then, the problem is that room lying ahead, huh… ?” (Burkhart)
The dragon golem with its intense breath attack was posted in a spacious floor.
By stopping its activity, it somehow became possible for us to relax our minds.
Aware of the fact that the missing adventurers had met their demise here, they must have ended up lowering their guard thinking that there wouldn’t be anything beyond this point.