Aw, bollocks. It happened to me again this evening, but I forgot to grab the test data. >.<
Will try to get the OHKO to happen again and grab the test data then (sorry, Sir Boris - looks like you're facing those Demons again...).
What I can say is that it happened immediately after levelling a Swordsman to L10 (20), so HP was auto-refilled to maximum. Next battle was against a Demon, who OHKO'd me before I acted. No status effects.
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