This becomes a shifty game of one-upmanship, then.
After Thor puts on the belt, then Supes takes a sun-dip, Thor asks for a break before the next bout, for some coffee. Supes says sure, I want some milk anyway. Ten minutes later, Supes is sitting down at the rock table ( which he welded back together after it's been crushed by previous bout), and Thor comes back in.
Superman: Are you all right? You look like you're twitching. Strong coffee?
(Thor just makes a grunt, sits down at the table with his arm up)
Superman: (Thinking-Maybe he's got muscle spasms, or his arm hurts. If he's hurt, we shouldn't do this. Oh well, Thor has that warrior pride thing, so...) Let's go again. ( Clasps his hand in Thor's)
Then Thor, in FULL WARRIOR MADNESS, roars and throws Superman's arm down and him smashing through the wall! In seconds, he's standing and back inside, though.
Superman: What the heck?! We're having a friendly contest here, Thor!
Thor: So go and sun-dip thyself again, Kryptonian! If we're being sneaky...
Superman: Well so what? It's not like a need a fancy belt to feel competitive, hippie-hair!
Thor: You want this belt?? You can have it, and more!! ( Strips off the belt, and lashes Superman across the chops, sending him back against the wall again.)
Superman: (eyes smouldering) Oh it is on...
(flies smack into Thor, taking them though the building and outside.)
Others gather around the hole to the outside.
Captain America: Uh...guys? ( looks to Batman)
Batman: (sighs) I've got my kryptonite ring here. I'll put in a call to Wonder Woman to bring her lasso.
Captain America: I'll tell Iron Man to warm up his Asgardian Armour. And see if I can reach Sif through the Asgard Embassy.
😛
