Next time i'll try to check if this ghost disappears. Never tried to turn all soldiers to another direction...
I have tried this... Alien (untargetable, standing, non-reacting) vanished. But when all other aliens where dead game crashed.
All i have got in log (non dev mode):
Team 7's round started!
[STATS] Nokim (Katie Dekkers) kills alien (Mrorg Ok Uhm Uurrp) with Snap Shot of pbeamrifle_ammo (entnum: 136)
[STATS] End of game - Team 1 is the winner
[STATS] Soldier Artur Dixit earned 114 experience points in skill #0 (total experience: 5043). It is now 10 higher.
...
STATS-STATS...
[STATS] Soldier Benoit Berg earned 164 experience points in skill #9 (total experience: 13442). It is now 18 higher.
Disconnecting...
Client stream was closed
Remove pending event 15
Error: Mem_CheckSentinels: bad memory header top sentinel [buffer underflow]
free: src/common/common.cpp:#1428
UPD: Somewhere near that alien his needler was on the ground. Alien (with needler in hands too) vanished and so that needler. No corpse left.