OK, so, I'm both of the prior two comments. Ring of blades +2 does more riposte damage than Flynns, but in return, Flynn's still grants its full bonus to infusions (just look at it on the fire longsword/poison broad). It also, for no reason, deals more damage in general than RoB despite them both claiming to add the same amount of AR (tested on some random mobs, flipping between both rings). It's usually only around 10 points more of damage, but it's there. They do both seem to make a difference on counterhit, but it's hard to say if the added damage is actually being multiplied by the counterhit bonus, or if the difference just comes from a base addition. It probably is multiplied by the modifier though; if it wasn't supposed to affect them, it would probably have just been set up like ripostes where you don't get ANY bonus from it, as opposed to one that's just outside the crit modifier. Either way, they're both much stronger than the leo ring if your base AR wasn't already huge.