Fallen soldier is an extremely aggressive NPC as it will pursue and attack everything that comes in sight including the player,goredolls,divine goredolls,and the undead.It will not stop shooting unless the victim is paralyzed,dead or unconsious.

Fallen soldier can take a lot of damage before dying especially if you dont destroy its head.Even if you manage to cut him in half or destroy all of its limbs it will still be alive albeit not possessing any threat anymore.A good solution to this is fire or grenades.

It is possible to steal its M249 or his Glock18. If you manage to do this it will attack bare handed

it notices you and it starts running towards you tempting to attack