[Tonbokiri blinks, pausing for a beat, then laughs.]

Ah, so you won't leave behind your polearm? Haha, I should have expected it. My apologies. Here, return the torch to me and I shall also answer your question.

[Having at least one hand free to use the ladder is important, and as Midoriya asked about how far down it was-- Tonbokiri takes back the torch and simply drops it down the hole. It sputters from the speed of the wind, but soon enough it hits the ground. It could be estimated at six or seven meters down, and the tunnel itself is narrow enough that it's almost a tight fit for Tonbokiri, but if he's careful he won't brush up against the walls. The demonstration thus complete, he smiles invitingly.]

Let us go, then.

[And he takes the lead, climbing down while holding his spear. When he gets to the bottom he knocks the torch aside with his spear so that he can get his feet on the ground. He then takes up the torch and waits. At the bottom there is a surprisingly large and stout-looking wooden door with a keyhole. Other than that, there is nothing of note. It is like this space was made only to access the door, so it is not particularly wide. The one thing that is of note is the malevolent air coming from the door, which causes Tonbokiri to frown, a crease forming between his eyebrows.]