He didn't allow anything. He wasn't in a position to. He was clearly outsized, outclassed, had no heart, was in the wrong, demoralized, etc.. It's not a question of what he allowed, it's a question of why dude decided to choke him out instead of punishing him some more. My theory is he wasn't thinking clearly enough to pull dude out from between the two vehicles cuz it was too narrow for punching and stomping with bad intentions. So he did what was available and choked little dude out.