[She's having a bit of fun with the door, that's all. The beach is unexpected, though!

She has to leap aside, away from in front of it, to escape being hit by the wave that washes in. Great, now she'll have to clean up sand and seaweed later...]

So they'll open to anywhere. It wouldn't do to walk through and get stuck somewhere without a door that goes back.

[But even knowing that, she'll peek back around the door jamb between waves to look out and around.]

This must look strange from the beach side!

[A doorway appearing out of nothing!]