They go for Diana’s belt

The adventurers are both facing either side of the hallway, backs towards each other while straining at the levers, keeping them down with both hands.

Though nominally without any intelligence of their own, the mage hands spot their opportunity; Diana’s got her hands full, and her pants are notably baggy, and so they invisibly float over to Diana’s midriff. There, they make their way down, and begin working in tandem to surreptitiously unbuckle her belt and let gravity work its magic.

Too preoccupied with her lever, and the soft clinking of her belt buckle drowned out by the rumbling of the stone wall slowly sliding upwards, the mage hands undo the belt. With the buckle undone, the tightly wrapped belt immediately slackens, only held aloft across her waist by the loops on her pants. The weight of the dangling belt is enough to begin pulling down Diana’s pants however, and with a little extra tug from the mage hands and some inadvertent movement from Diana herself, her pants immediately flop down all the way to her ankles, revealing her bare legs and her plain khaki panties.

”Eek!” Diana shrieks as she feels her pants plummet, letting go of the lever and quickly reaching down for her pants. The wall swiftly slides back down.

”Wha’ the-“ Tyra mutters angrily at the wall and her lever, before she spins around and whatever she was about to say gets stuck in her throat as she’s met with the sight of Diana reaching down to haul her pants back up.

”W-Why’d your trousers drop, Dee?! Y’ever heard of a belt?” Tyra stammers, awkwardly avoiding looking directly at Diana’s undies as an embarrassed Diana hoists her pants back up.

-“I don’t know what happened, I’m certain I buckled my belt!” A prickly Diana replies as she shamefacedly redoes her pants.

”Ya got lovely long legs but this ain’t the time for ‘em”

-“I didn’t do it on purpose! Let’s just get this damned wall up”, Diana moves back to her lever

The pair begin pulling on the levers another time, and the wall once again ascends, creaking closer and closer to the ceiling.