Thanks for playing!
Yeah I opted for an Action Button trigger once you're armed, so that if you're low HP you don't accidentally engage an enemy because of Player or Event Touch and get smoked, since damage is automatic once you engage. You got it, once you engage several parallel Common Events kick off to handle the damage, enemy sprite flip, attack animations, etc...
Thanks again!
Edit: was there a particular mechanical issue you ran into with fights? Let me know so I can consider it for the post-jam update.