I have been testing it more today and it makes my Heavy/Light all pop up saying crit, so I am not sure what to say to be honest. Follow Through is the same crap as always though with/without Blindside, I am seeing almost no difference between them. Using other buff spells shows considerable more dmg on a WS but Blindside+FT is showing almost no change.

I guess I will go test it on some other mob types and see if there is a difference. I have been testing it on silly ass goats.