It can go either way. Remember that Marty made no explicit threats to Cyraxx on his trip here while Cyraxx has explicitly stated that he was going to injure Marty multiple times this past week alone. If the police get called, they'll likely take statements from both people, review the footage (which is grainy) and maybe either arrest the both of them, or warn both of them.
Luckily, Ohio passed a stand your ground law and you can argue that Marty's actions weren't disproportional to the threat, so he was under no obligation to retreat like in other states. Police can get probably get him on simple assault or disturbing the peace, but that would also require arresting Chance as well since Raxx was the tard who instigated things.
Attorney James D. Owen, a Columbus criminal defense lawyer, discusses the long-established right in Ohio to use deadly force when acting in self-defense.
columbuscriminaldefenseattorney.com
At the end of the day, I think it comes down to if Sally is willing to risk her baby pedophile spending a night in jail in order to get at Marty. Which I personally think she won't.