Of course, I think, "Oh hey, that was pretty slick. I got this covered." So I shoot the guy on the side, and enter the helicopter by throwing the guy out inside. I fly around shooting enemies on the ground, then three helicopters fly up behind me and shoot me up a ton.
I try to fly away, but they blow up the helicopter just as I jump out and billow my parachute again. I fly down to the ground slowly while trying to grapple the enemy helicopters, but instead, I just land on the ground, then try to run away. By this point, my health is down to about 30%, but I keep trying to run. The helicopter shoot and shoot at me, but I attempt to dodge each time. I start frantically firing my grappling hook at the helicopters again, attempting to latch on and take one over, but my mashing buttons kind of messed up the aiming just a bit. The helicopters catch up to me, and I'm screaming at my friend, "I NEED BACKUP, I NEED FREAKING BACKUP!" But he just shakes his head menacingly as my character gets pelted by bullets, and in the end, dies by a rocket blast that shoots him up into the air, then gets chopped up by the helicopter blades.
The moral of this story is, bring backup.