Incoming fire has the right of way. Don't look conspicuous, it draws fire. There is always a way. The easy way is always mined. Try to look unimportant, they might be low on ammo.
Professionals are predictable, it's the amateurs that are dangerous.
When you're ready for them. When you're not ready for them. Teamwork is essential, it gives them someone else to shoot at. If you can't remember, the claymore is pointed at you. The enemy diversion you have been ignoring will be the main attack.