"Now now, kids, no need to be in such a hurry to shoot everyone and go home. The day has only just started!" It was supposed to be fun even though he could tell that only half the team thought it would be an enjoyable exercise.
The whole point of trust-building exercises was to have people working in teams, but when things got competitive it also always got ugly. And plus, they had plenty of other opportunities to work together on different projects.
"Each man for himself - aim for the chest." Which meant no shooting people in the head, groin or legs.