why can her "iron balloon" be deactivated if she is sad?
Why is it that when she starts crying, she can get hurt by simply falling on her knees?
It is a fact that she constantly uses haki to boost her defense. Law's statement proves this. Now as to what type of haki? I can't say.
But given how she rarely uses the black lightning variant of ACoC, I wouldn't be surprised if she is using an invisible variant of ACoC(like what Zoro used against kaido) to coat her entire body.
Why is it that when she starts crying, she can get hurt by simply falling on her knees?
It is a fact that she constantly uses haki to boost her defense. Law's statement proves this. Now as to what type of haki? I can't say.
But given how she rarely uses the black lightning variant of ACoC, I wouldn't be surprised if she is using an invisible variant of ACoC(like what Zoro used against kaido) to coat her entire body.
All that black hardening and lightening shenanigans that Oda began highlighting in PTS is just for reader's benefit or to give more focus to certain "Epic" clashes.