replying to Stormsnomore, passerby wrote:
If the swelling is not visible (or minimal), and at least a few hours have
passed, then there is no reason to even touch it. If it were to swell, it would
have done so already. Once it swells, there's nothing you can do except replace
- it will stay warped even after it dries. That said, it is hard to say which
way the water goes between underlayment and the planks. If it's very recent, and
I mean just a couple hours ago, you may still see some more swelling elsewhere.
Not much you can do about it but wait until the event is over, then assess the
damage and replace what's damaged.