Congratulations, I was wondering if that Marine would remind anyone of Stacker in BCM47. Especially since that movie likewise ended with me taking offensive action to stop the movement.

: Sometimes I think the NPCs in Halo go a bit loopy in the head... or they're just
: incredibly dumb, it's hard to tell which.

They seem to have problems with certain angled surfaces. In regard to the place where that Marine was, it's quite common to find a covie thereabouts at the end of a trough defence (e.g. a Grunt in BCM90). Can't say I've seen them doing a dance though.