i had to plasma pistol and melee a concussion rifle to death at one point. what i mean when i say that, is that nothing was actually holding the weapon itself, or that perhaps the enemy was so small i couldn’t see it behind the much larger weapon that it was “carrying” (dragging along the ground). it turned out there was at least 5 or 6 of these guys, many of which had the strength of elites. while they were a total pain in the -Yoink- to take down and i’m not even sure if it looked that way to the other 3 players, but i suspect that it did, it was pretty awesome haha.
weapons running around of their own will and jumping a foot into the air to be able aim high enough to shoot you in the face. they pwned us hard before we recognized what was happening. so cruel that i can’t take a video of spartan ops to save this. 
definitely the strangest thing i’ve seen happen in halo 4 so far.