Cool but... That's a high fee for Bitcoin-to-Bitcoin. Handy though.

It's trustless right? I guess the swap provider partially signs a transaction that requires the same pre-image that the Lightning payment depends on? Although, I'm not sure about confirmations - we need to ensure the Lightning payment is held back until there have been a few confirmations?

it is waiting for one confirmation before revealing the preimage

When all the more urgent stuff is done 😎