They meet up in the sky high above Metropolis, flying opposite directions. Tony makes a snarky comment on her lack of a "suit." Diana takes exception, and it's on. A win is a knockout. They aren't trying to kill each other. Just an exhibition that Tony's thoroughly enjoying. However, Diana wants to end it quickly and move on with her day. Iron Man has his usual yellow and red suit, and Wonder Woman has her usual weapons. If necessary they can both fly down to Metropolis to get stashed upgrades. Iron Man's would be extra weapon attachments, and Wonder Woman's would be a sword, shield and javelin. If they upgrade then the fight can be won by gaining a killing advantage OR knockout. Killing advantage would be Wonder Woman getting her sword on Iron Man's throat, at which point he would stand down in defeat.