If I File A Police Report After Someone Files A Police Report On “me” Will I Get In Trouble?

(Columbus Ohio) To keep it short. There was an altercation between two of my friends. I’ll call them Jane and John. Jane threw a 5 gallon bucket at John and started attacking them. They bit him, pulled out a huge chunk of his hair, and punched him. John tried to put distance between himself and Jane and pushed them. Eventually he took a swing at Jane in self defense and then removed himself from the situation. Jane followed screaming and yelling into the house and was eventually told to leave. Jane, the day after (today) filed a police report. Or so they say. My question is, if John files a report himself, can he be arrested, or will they just reach out to him? I watched it all happen. The only reason he hasn’t called is because he doesn’t feel safe. We’re at a loss. We don’t want him to end up in a Holding cell or getting arrested but he needs to file a report and a restraining order.