Originally Posted by Lukhas
By "elbow the enemy", Jeff means that in your trophy pose, your elbow should be away from your body. Basically he often sees beginners having a shoulder almost stuck to the body in trophy pose. So he says "elbow the enemy" to get it out of the way. The same way, Federer says "keep your elbow high". Which basically means the same thing: elbow out of the body in trophy pose.
What is meant is not that clear at 2:08 in the video.