This one was actually interesting. The modified grunts in question are grunts with bot AI and weapons. They die easier then a regular bot, which is good because ammo is scarce and there are only a few weapons. The map doesn't feel like a bot match, but an actual SP map with smarter grunts. You have two keys you have to find and there is an exit at the end. Basically, this is a DM/SP hybrid map and not just a DM map with some monsters in it. Not a bad concept.