green beret chris corbin and ax almost died together in afghanistan on their final mission. corbin says everything was going right that day, and ax had already found one bomb. they moved together to an area that had been cleared, and that's when he says he missed ax's signal. >> corbin: all of a sudden, he wasn't pulling forward, he was pulling down. i was, "what are you doing buddy? hold still." i wasn't thinking it... maybe he's sniffing my foot, maybe i passed by a dog-- all these other things why he would be looking down. and i looked down, and he was just intently sniffing all around my foot. and it started to occur to me that, okay... >> logan: wait a minute. >> corbin: with wires coming out of the building, we're already in a place that we know is full of mines, why is he sniffing down on my foot? and at that moment, it was just that, too little too late. and that was it. >> logan: ax was shaken up by the blast but not wounded. chris corbin lost both his lower legs. yet, in less than five months, he was back on active duty as a green beret. he says ax had a lot to do w