DarkSaint85
Bonified abstract
2 hours prep starts.
Bruce uses his teleporter, goes to grab Iris/Linda, and teleports them somewhere with enough oxygen to last the remainder of the time +30 seconds. He does this in complete darkness in the cave, using his special night vision lenses. Wipes the teleporters' computer memory, erases all trace of where he sent them.
Writes down that he has Iris/Linda teleported somewhere in the universe on a giant card, with the amount of air he gave them, then sits back.
Match starts, Wally rushes in, fully intent on stopping Bats. But the card is there, and he reads it. He only has 30 seconds to save them (maybe set it up to be a timer and acid? You get the gist).
Forfeit the match, or they die. If more leverage is needed, Bats just grabs more people, whatever.
It's a continuation of what he did with Superman in Hush, except he used Catwoman to go after Lois.
We can modify it if needed, am happy to take suggestions to refine it