create some big battle you (5 immortal man) and for example 30-40 enemies and 4 ammo crates. Now let them fight, but keep close to ammo crates (no more than 300 meters from them) if you mate will be out of ammo order him to rearm. he will kep aiming (god bless immortality) but not shooting. you can wait endless before he run to ammo crate, but he will do that in next century, and then HE WILL FREEZE next to ammo box and say "READY". ok you think everything is ok, but truth is he get only ONE MAGAZINE and he starts crying very soon.