LAS VEGAS — As Panthers defenseman Brandon Montour slid a pass through the slot to Matthew Tkachuk, Vegas goalie Adin Hill realized Tkachuk was in perfect position for a one-timer and executed a compact butterfly slide. It was a technically sound move that took up most of the net, but Tkachuk didn’t shoot. Instead, he passed the puck against the grain to Nick Cousins on the backdoor, and Cousins received the pass staring at nothing but a wide-open net. Advertisement At that point, Hill threw technique out the door. He leaned backward, stretched his right arm as far as he…