I can't tell... is the marine's hand around the throat of the storm trooper? I can just imagine him moving the storm troopers head around from side to side with his thumb, seconds before he snaps his neck.
Awesome bit of artwork, including the text.
it's indeed shakesperian u can clearly see that the way the thumb is positioned and the other fingers u can see at the back of the storm trooper helmet. Also marines could never be killed by storm troopers xD