Oh, I smell it now.

[Yeah, that's rotted meat. Best track it down, then.

(Also, Respectable Elder?)]

If someone committed murder here long enough ago for it to smell like that, they're probably not still around.

[But yeah, he's keeping his guard up. He'll even gesture for Tanjiro to check out one room while he looks in the other! If they pass by a room without clearing it and some murderer actually comes out behind them, he'll feel really dumb.]