@Psychronia Sure, the doorway makes for a fantastic choke point, but the dungeon is, as far as we (and they) know, a single corridor that dead ends, they have very limited supplies (maybe a day or two, possibly a week with severe rationing), and they're outnumbered at least 3 to 1 (I counted at least 15 humanoid shapes on the last page). These bandits could easily just wait a couple days for them to either die of thirst or be so weakened by lack of water that they're easy kills.
Granted, that's less an issue because Pochi is pretty OP and Asley has stupid powerful magics, but if they're every bit as vulnerable to arrows as the average person, then, well, see the above.