I don't know, whether we need separate experiments for this issue. But I consider this experiments as possible:
Check difference in detection of wall or copter by other copter, when both copters are killed.
Check difference in detection of wall or copter by other copter, when one copter is killed and second copter is in wall_avoidance mode, but firmly fixed by hand.
I don't know, whether we need separate experiments for this issue. But I consider this experiments as possible: