This is supposed to be her apology in some ways, but she can't stop the completely unimpressed, flat look she gives him at his vote of confidence. Here she is trying to apologize (never mind that she hadn't actually uttered the words, "I'm sorry") and he's being stubborn about it.

Her jaw sets and there's a look in her eyes that clearly says she'll show him who's going to break their neck before marching right over to the edge of the cliff. She arrives just in time to see the last local from before leap off the edge and it doesn't look elegant by any definition of the word. And while it doesn't look elegant, she watches as their head emerge from the waters sans a broken neck. If they could do it, so could she.

"Well if you don't teach me then I'm just going to dive off. It can't be that hard."