I thought that is intentional in order to make this game for challenging. My theory is that this system allows other players to stand a chance against certain metas (like the Sus. Kakashi meta like in your example) and also makes the characters that have an instant mystery that much stronger. There are for example certain mysteries that are less reliable and have a longer startup time thanks to the action that comes before that mystery (like Gakido's mystery for example) which allows the opponent to have more time to react to your movements. For example if you want to clear your pos 1 ninja of Acupuncture and Immoble with Gakido, he first has to remove one layer of debuffs on your team and THEN c*e his mystery. You c*so wait until your Gakido does his standard which he has to remove one layer of debuffs for and right before he does his standard you pull out your mystery. In that case your opponent can't react because now your mystery was instant. What your opponent can do though is acupuncture you right after you removed one layer of debuffs. This is just one example out of many how this system can make the battles more interesting. In your example you are actually forced to do your mystery at the start of round 2, otherwise you can't reset with standard. I used to rage about this quick reaction system as well until I realized how much depth it added to the overall battle strategy. It used to be a problem back when delay was still a thing (which is still sorta is if you are suffering from massive lag).