@ 3:32 in this video you can see what lastjedi is referring to:
http://youtu.be/WASr5-mS238?t=3m26s
Though I can't remember if it was like this all along or if it's been changed tbh.
If in ESB:R is still like that ^, it could certainly be upgraded with some sort of hint of damage or a flash at least not to diminish the idea that the "armor is too strong", but would improve with some kind of reaction from the leg being hit.