He's wrong on that front. She doesn't trust him not to weasel out of the bargain, whether by finding some loophole or declaring her side invalid. She'd learned long ago that the Red Room's trainers can't be relied on.

Never mind that he'd never made any promises to be broken.

She rocks back on her heels, then up onto the balls of her feet, then takes off, with the sort of abandon that suggests while she's not exactly courting injury, neither does she especially care about it.