Cant really be bothered to read the whole three pages but the simple most affective way i have found is run and gun, keeping him posted, then as you get around 10-15 yards from the bunker change the angle of you run to the side that the player way not visable from, then simply get alot of forward momentum going, keep you gun up, but... dont shoot if it isnt nesseccary and come round the side, make sure you got the player well enough so theres no chance of him spining and catching you.
Hope this is easy clearly explained