INSIDE THE BUNKER
The diversional player has to not care if he/she gets shot a lot. He/she should come right up the middle, shooting off a lot of shots to keep the people in the bunker down, then run right by them, and keep shooting, try to find shelter.
The actual bunkerer should then wait until the diversional gets across the bunker to then start charging the bunker (prefferably from the side.) If done correctly, it can be a game saver.
Make sure to know what you're about to get into, one slip up, and and you got yourself a red shirt.
Charge at the right moment, when you know the people in the bunker are dozing off and they let their gaurd down. Try to keep a low profile, don't charge when you're in a crossfire with them.
Try to charge from the side, or anywhere there is no or little coverage.
Keep shooting to keep them down and momentarily defenseless. Run right by them, still shooting. And if you're really brave or just high on adrenaline, try to get in the bunker with them!