Those guys were fools. I would have either yelled and started throwing things at it or left the area for a while. No unarmed man stands a chance against a raging buck. You are just asking to get killed or severely maimed standing up to one like that. They almost found out.
Wow! Awesome video and experience but I agree, that could have turned out extremely bad! Even knowing the possibility of that deer charging at any point in that encounter would have kept me away (and telling my buddy to go get the bow to fill his tag! )
I applaud them for getting the buck free but it was not very smart to walk up on the buck like that after it was free, he is one luck dude! Like was said it could have turned out much worse.