I dont know if it was a glitch but I was able to do a small hop and then immediately after the hop i did a dive to prone. It was weird but it looked cool or so my friend said after he saw me do it.
I've done a little testing on Flak Jacket, if you feel like dying over and over. Flak jacket doesn't protect you from your own explosions. It also won't protect you from direct hits from a smaw or rpg, or a semtex stuck on you. I haven't done extensive testing on this, and you seem to enjoy your work.
Love the vid by the way, gonna check out the others.