I seen a home video on TV a while back that had 2 live bucks locked up fighting in the snow. They got hung up on a fence, and some guys used a chainsaw to cut their antlers to free them.
I seen a picture of a mount of 3 bucks locked up. Some hunters came across them and shot them. 1 was dead already, I think. They barely left enough cape for the taxidermists to work with. They said the 3-way mount is worth alot of money because it is the only one, if I remember right.
I would probably shoot the live buck in a 1-dead situation, or if I had 2 buck tags left, I would shoot both in situation with both alive.