If your short on everything but enemy, you're in combat. Incoming has right of way. No combat ready unit ever passed inspection. No inspection ready unit ever passed combat. Teamwork is essential, it gives them more people to shoot at.
Tracers work both ways.
The only thing more accurate than incoming enemy fire is incoming friendly fire. Try to look unimportant, they may be low on ammo. Radios will fail as soon as you need fire support. If they're shooting at you, it's a high intensity conflict. A sucking chest wound is nature's way of telling you to slow down.