Sorry, I don't have screenshots. But take my word for it: I just had this battle as I was grinding arenas:

In the first fight, my opponent had Liquid courage + Double Edge running, so I thought 'okay, that'll make this quicker. Permanent Power Gain for Blade in the next fight'...
Then my second fight was Blade Vs Ebony, and the LC/DE debuffs didn't trigger. 'That's odd." I thought. 'Didn't he have debuffs last time? I was looking forwards to getting all that Power because he was bleeding....'
Third fight, and they were back again. So I decided to at least capture an image of the arena, and see if anyone else had observed this.
Has anyone else run into this? I can't see any synergies that would be active. So did Danger Sense prevent my opponent's Recoil Masteries from triggering?