She makes the trade.

"Yes, of course. Just don't do it!"

She bends over and unzips one boot and takes it off.
The other follows.

"Now hand it through the slot," Hatter explains, gesturing towards a hole in the plexiglass.

With ****, Supergirl hands over her boots- putting them on a table- and waits for what will happen next.

"You made the trade. Good job."
"Now let her go."
"Hmm...no. I give you my word that she won't ju-almost didn't again. She won't do that thing.

Let's see Contestant #2..."

The door slides open and other one of the Gymnasts is there. She's on the ground this time, with one hand behind her back.

"This is Trade or No Trade," Hatter says doing his worst Pat Sajack impression, "What do you offer?"

The Gymnast reveals her hidden hand- it's got a knife in it.

"Give up your Cape or I cut my throat."
"Great Krypton!"
"What will it be, Supergirl? Trade or no Trade?"
"Yes! Just don't do it!"

She quickly undoes her cape and hands it through the slot, setting it on the table with her boots.

"You made the Trade. Good job. Shall we see what's behind Door #3?"
"...please don't. Just stop this."
"You want me to say the J-word," Hatter says menacingly.

'Shit. No chance here. Just play along.'

"Yes...I'd like to Trade..."