Lars whispers "Finish that quickly, then follow me quietly. Shutter the light when you follow, until my signal. Each one place a hand on the next fellow's shoulder so you don't get lost or bump into each other."
He wipes the bloody edge of his axe off on the felled hobgoblin's clothing, then drags the hobgoblin carefully halfway down the stairs. He focuses a moment to see if he can feel any evil radiating from the goblinoid, just to confirm his suspicions, and returns to the top of the stairway, walking quietly in the opposite direction from where the voices are coming from.