It's one thing to know that your friend is trained in wartime battle and his fighting experience is pretty much all life-or-death stakes.

It's another thing to watch him lop someone's arm off.

He's in the midst of calling out to Nico that he's okay when it actually hits that Nico cut a man's arm off. Luckily, the last guy standing with a gun is in shock, long enough that Tim's able to disarm him before he does something stupid like shoot at Nico, and then he's doing a quick scan of the surroundings for the nearest item that could be turned into a tourniquet before someone bleeds out.