And yet not using something that would give you an advantage just because you decide to be stubborn could also leave you at a disadvantage.

[Which is something she's not okay with.

She almost threatens to stab him when he gets closer to her, but doesn't. Him moving the sand isn't going to hurt anything, and there's no one else around (as far as she knows) to witness any failings on her part.

He only gets a few moments to shift sand before she starts motioning him away again, though.]

That's enough. You can dig up your own things.