If there wasn't some promise of an eventual payoff he wouldn't be frustrated to begin with, so in the grand scheme of things it's a small price. Besides, having her pull back and pause is a much gentler interruption than a thrashing foot-long fish. And it is a pause, not a hard full stop; so really there's a minimum of grumbling as he pulls away and twists to stand and do as asked. (Not no grumbling, but if there was no grumbling she'd have to wonder if he was taken by pod people, probably. At any rate it's the good natured kind.)

He's wholly oblivious to any nefarious plans that might be afoot. That sucker.