Let's go this way. There are insect-like humanoids in here, doing various minor tasks, it looks like. It's a thin cord or rope. Neither is the chamber, from the looks of things. From some other room beyond, more insect men come, stepping gingerly over the charred, sparking bodies of their dead brothers.
Bloodlust shines in their multifaceted bug eyes.
Never make fun of the dungeon master. Watch where you're going, clumsy fool. You can hold the damned bugs off next time. The party fled down the unexplored passage at breakneck speed, closely followed by a number of giant worker ants, giant soldier ants, and aspis drones. It had better do it.