For showing the players what the denizens of the Caves of Chaos look like.
Sometimes Jim Holloway hits it out of the park. I'm not a fan of his depiction of adventurers as hapless Three Stooges doofuses (much as I know this to be something that many OSR bloggers love as a characterisation of same), but he is great at showing humanoids as brutish and, above all, practical. Their armour and weapons are cobbled together but do the job. Nice work, Jim.