What to do about knock backs?

[Kurando]

Not taking damage means no knockback, right?

It depends as some knockback attacks don't actually deal any damage whilst some do, so yeah you could cheat it with an active barrier (like TBN or Galvanize) but that doesn't work with everything. I think o5s is an example of where barriers aren't enough to avoid knockback from the ghost, at least that's what I remember but never tried to cheat it outside of anti-knockback actions so can't confirm it.