With all due respect, [Of which, there is, thus far, no particular compulsion to feel.] if you search for a viable entrance before something is found to buffer the sound, we'll end up back in the exact same position we began.

[And Armin will end up dragging his stubborn ass out of the street before he's eaten by a demon.]

[Not to worry! He'll simply figure out a plan just like he always does. Maybe Akechi would be opposed to ripping up his pretty scarf of his, but Armin-- Well, actually, Armin's just dying to rip up this coat he's wearing.

[Lifting up the edge, he tears off a strip of fabric with his teeth; repeats this until there are four small sections. He hands two to Akechi.]

This ought to do the trick. I'll invesigate the front entrances further while you take the back - as you suggested.