So this was know amongst all of us here. The glaring issue is players like you who are well out of the loop of how this game works. There needs to be better communication of how moves work, the properties they have and the interactions they have amongst all other relevant characters and moves...etc.
OP you can check out youtube and see Freeze's video on nuxia. There are a couple and this is listed among the things pointed out. However you shouldn't have to, because Ubisoft should be doing this themselves.
Well personally I am with the op that its weird. I watch freezes vids in pretty much every instance due to the information they provide, but it still feels bad that her deflect is not guaranteed. Of course, it hits very hard, but they could just make it unblockable and all problems solved. Because - .lets be clear about this: the harder to get punish possibly nets you less. That feels more like a mistake then a design choice.