Munchkin Impossible Black Oops! Question

[GrivGodmode]

The scenario is someone kicked open an "..in black" monster for their final combat, and Black Oops! was played. Black Oops! removes all "..in Black" monsters from combat, they then leave their treasures behind, however the munchkin/s only get them if the munchkin/s beat all the other monsters in combat.

My question is this; If the only monster in play is "...in Black" and Black Oops! is played does the combat end because the only monster in play is removed from combat, or would the fighting munchkin get a chance to add more monsters into the fight to try and win?