Brogue Wiki
The rickety rope bridge creaks underfoot.

The rickety rope bridge is staked to the edge of the chasm.

A bridge spanning a chasm. It can burn, sending anybody on it plunging to the next level. Note that the two ends of the bridge will also burn but have ground underneath so monsters will not fall.

The dungeon generation algorithm ensures that there’s a way between any two points that does not involve bridges. So, after you burn the bridge, the dungeon will still remain perfectly passable, you should just search for hidden passages.