Death or KO.
Both are EoS. So Tien as per Tourney of Power and Mark as per upgraded by Atom Eve.
Both sides are fighting to the death.
Both sides have no knowledge of the other.
Battle in Tourney of Power ring with empty space outside it. Start 100 feet apart. Mark gets space flight here, not atmosphere flight.
You know what Mark does. He punches, bites, and on occasion lightspeed ram you into something hard.