[ she sees the waterfall coming, and figures that they're going the scenic route. That's nice. Until Batman guns it, and Pepper realizes that they're going straight for the waterfall, and doesn't he realize that there is ROCK behind the water? She can't help the little shriek of dismay that she gives right before the impact---though there's no impact, because the waterfall was a secret entrance and Batman is an asshole.

She gives him a look. ]