Apparently Charlie Lee did a LTC/BTC atomic swap back in 2017, but I can't seem to find how he did it:

Found 2 twitter posts, one mentioned decred and another does not mention decred for atomic swap he performed:

This one mentioned decred: https://twitter.com/satoshilite/status/910534107058233344?lang=en (5:00 PM · Sep 20, 2017)

This one does not: https://twitter.com/satoshilite/status/911328252928643072?lang=en (9:36 PM · Sep 22, 2017)

Regarding the Sep 22, 2017 twitter post, do we know if he used decred for that too, or was that a more direct atomic swap between LTC and BTC?  If it was more direct, did he record the steps he took to perform the transaction, so I can try reproducing them for "learning-by-example" purposes?