[What Miles is assuming about her skill set is that she's frightfully competent-- Braun had said it's only the top ten candidates, and reminding him of Bothari and Quinn is no casual recommendation-- and used to acting independently, if she's meant to police the people that regularly fight frankly absurdly large titans. Even if that weren't true, he's presuming ability and will continue to so presume until she proves otherwise. That gets better results than the opposite approach, he knows from experience.

He catches immediately that she's not necessarily looking for money.] It's contingent on something else pulling through, but if it does, you'd be planting a small device on the turtles, [he explains, going for broke.] I'll take half.

If you agree, I'll include you in any opportunities I find to fight the enemy. [He levels a knowing look at her.] That's what you really want, isn't it? [It also conveniently gets him exactly what he wants: her agreement to future cooperation. He's just trying to sell it to her as something for her benefit. Take the bait.]