Explosion

Ares pushed Sam off of him and escaped.

He didn't expect such a crazy style of fighting from Sam. It is without finesse. The movements are weird and there is no connection between the first and the second move. It is a nonsensical way of fighting.

Sam didn't want to give Ares any more time to analyze his style.

He is indeed using a nonsensical way of fighting, precisely because he knew how easy it is for Ares to figure out his patterened and regular fighting style.

He disappeared with space element and reappeared behind Ares.

Ares' instincts screamed a punch was coming from the side, but a kick came from a completely different side. He barely tried to block it in last minute, which still made him take a huge brunt of the force from the kick.

Then Sam disappeared once again.