He punches Nathan

Seeing her blush and knowing that feeling himself tips Alex over the edge. He acts.

'SLAM'

His knuckles crack into Nathan's jaw as a grasp echos around the nearby party goers.

"Stay away from her asshole! Come on Ella"

He grabs the now stunned girl by the arm and pushes through the crowd of onlookers. Mummering abound, he holds on tight to the blond now cupped in his arms as the weasel their way out of the packed building and out the front door.