Sorry for late response.
I got caught up in work.
But here's the FFG answer about Flow Like Water (26016) and Desperate Defense (09015)
Thank you for your interest in Marvel Champions: The Card Game.
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Flow Like Water triggers when you resolve the ability of a Defense-traited card. Say you have it in play when you make a basic defense, allowing you to play Desperate Defense. You’d resolve Desperate Defense by giving your hero +2 DEF, creating a delayed effect, and discarding it; that’s the point at which you’d trigger Flow Like Water and deal 1 damage to the minion, defeating it. The minion is still considered to have attacked, and you have still defended and taken no damage, so you will ready your hero.
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Feel free to reach out to us if any more questions arise!
Sincerely,
Alex Werner, FFG Game Rules Specialist
Rules questions and their answers are reviewed by both the Marvel Champions: The Card Game design team and the Game Rules Specialist.
So, your point stands correct, but now 09015 is considered bug from this FFG reply.
In 0.5.8.166 version, when an enemy is defeated from 26016, 09015 does not ready the hero.