Order of Exchanging Revocation Keys during Lightning Transactions

Order of Exchanging Revocation Keys during Lightning Transactions

How do Alice and Bob share their preimages simultaneously? If they don't, and let's say Alice first sends Bob her preimage. At this point, Bob can broadcast his current commitment transaction, and the previous commitment transaction (as he still has not sent his previous commitment transaction's pre-image to Alice yet). But Alice can only broadcast her current commitment transaction, as she has sent her revocation pre-image of her previous commitment transaction to Bob already. This asymmetry is a bit baffling.

If the previous commitment transaction favored Bob, what prevents him from broadcasting it - knowing that Alice cannot penalize him.

My guess of an answer for this is that they share their pre-images based on whether value is flowing from Alice to Bob or Bob to Alice. As in, if the previous commitment transaction favors Bob, then he has to share his preimage first. Or some such.

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