"Clearly not," is Law's response to that — if they could have done something... wouldn't they have? It's not like any of them were having a particularly fun time hallucinating and nearly drowning, after all.

(He sounds rather pissed about this fact, though... any powers that affect the mind are, in his eyes, the worst. He'd rather lose his arm again than have his mind be messed with.)

The question Cora asks is one he himself would like the answer to, too, which is why he stays quiet... but he's not going to hold his breath waiting for an answer.