Combine BTX-lock and BTX-refund conditions about xmr-btc-atomic-swap HOT 1 CLOSED

Because you introduce an race condition.

In that case Alice can wait on Bob to start a refund with path 2, when she sees <h_b> value she can try to complete the swap on the BTC side (path 1) with higher fees AND get the Monero back with <h_a> and <h_b>.

If she managed to do it, she gets BTC and XMR. (At that point Bob can also race, all values are revealed.)

To be safe Bob needs to:

1. Broadcast the Refund transaction,
2. Wait enough confirmations invalidating path 1, and
3. Complete the refund, reveling <h_b>

No race is possible in that scenario.

from xmr-btc-atomic-swap.