Stand corrected -- thanks. Will leave my comments up for posterity -- also because my ultimate advice is to walk away -- though, you're right, that's evidently not exactly what OP is looking for. He does mention martial arts as an item he'd be interested in exploring, but in context, I suspect he means as a kind of physical means to de-escalate a conflict.
Not sure if it's much help, but here's a couple articles on conflict de-escalation techniques:
How to De-Escalate Conflict in Any Situation (rewire.org)
4 ways to de-escalate conflict with better communication (bizjournals.com)
Good luck, OP. And congratulations on looking for ways to avoid fighting to resolve conflict.
(post is archived)