# Open editor
# Place first rifleman
# Place second Rifleman out of view of first rifleman and make playable
# Group second rifleman with first rifleman
# Play mission Single Player
# Kill yourself (run debug command: player setDamage 1)
# Use Team switch to alive playable rifleman (he doesn't know the team leader is dead yet)
# Press back tick and select "Switch to leader" from the menu
The game will be stuck looking at the ground with no way to exit the game or mission.