After the third or fourth shot, the bag will catch fire and you can use the whole setup as an anti terrorist flaming war club until it goes out. By then you will have defeated all the terrorist in CQB range, the bag will be gone and you can now use your laser sight to "snipe" the remaining medium and long range tangos. Yippee-Ki-Yay MF!!!!!
Just don't forget your knee and elbow pads for when you do tactical rolls.