At first glance it looks like this player just smacks his head while going for the coup de grĂ¢ce. Turns out there's a bit more too it. Make sure you stick around for the second angle.
"TimewornDoctor was screwin' around on the Storm and was going for the final kill. He wanted to use the Hammer once more and thought he had the Storm in the bag. Apparently the AA Gun had other ideas."