Two evenly-matched opponents are still evenly matched even after losing their weapons.
Do We Have This One? Never Bring A Knife To A Gun Fight, right? Unless you plan on the fight lasting so long that you run out of bullets. But you never bring your fists to a knife fight, right? Unless the fight lasts so long that your blades dull or break, too. Stalemate To The Fists is where two opponents seem to be so evenly-matched that, even though they begin the fight with proper weapons (or superpowers), they eventually keep fighting it out that at the end they are reduced to just punching each other. And even then, there might not be any clear winner. You can expect both parties to experience a Heroic Second Wind. A convenient way to end the fight if Defeat Means Friendship. Also a good way for one party to eventually give up and declare the other a Worthy Opponent. Needs A Better Name Seen It A Million Times
Examples:Mahou Sensei Negima: In the Negi vs Jack Rakan battle, both of them launch devastating attacks until they run out of steam, and get up to continue pummeling each other.