'2 dead, one missing' ?

I still don't get it after many viewings.

First night, Riddick strikes.

One guy gets crushed by the two traps, and we then see no one else getting killed onscreen. Just blood tracks, and the one guy dragged by Riddick.

Then what about the other guy in the body bag? Is the guy missing supposed to be Falco? I guess so because I think they found him in the cave (resuming this awesome movie now).