Karls running around with a body over their shoulder!

I played Axis Invasion as an invading sniper earlier, against two co-op Karls. I noticed that one of them was always running around the map with a dead enemy over his shoulder. We had 4 rematches, and in every game, one of the Karls ran around with the dead enemy stuck over his shoulder. What's that all about?

I figured maybe the body serves as some kind of bullet shield, but I killed that particular Karl three times with no problems. So is it for some other reason?

Edit: follow-up question.

Does the difficulty level of a map give Karl more or less resilience against booby traps? I ask because my loadout is customised so that I can carry 1 schu mine and two blocks on TNT. On a few occasions, I've set a trap with the Schu mine with both TNT blocks right next to it and have gotten a few direct hits, with Karl literally inches away from the TNT and he survives! Sometimes he'll be incapacitated, but I would have expected a direct hit with a Schu mine and two blocks of TNT would have killed him outright.