@sabinis:
Why logia user would not take damage? If they would be fighting standing on material other than stone then without enough agility Pica would have been wounded even as logia user as Zoro is CoA specialist.
As for other logias not being able to "run" through material and emerge from it, look here
! http://z.mfcdn.net/store/manga/106/69-686.0/compressed/v007.jpg
! http://z.mfcdn.net/store/manga/106/69-686.0/compressed/v009.jpg
So Monet also travels through her element but we just see snow falling in place where she was as its not as solid as Picas stone so shape changes.
but my understanding of logia behaviour is: monet becomes the snow that falls on the ground and travels as this snow. and the way pica travels through the parts he just controlled is different. its not that the pica-like mass of stone submerges back into the stone. instead his image just stays in that point and he just leaves the casing. its the same with the heatball thing or aokiji not getting pierced by whitebeards spear. they become their element and (try to) dodge.
if pica extends his arm at zoro, zoro could cut that part with CoA and pica would take damage. like when luffy was able to grab the smoke of smokers arm.
!
but its just stone he cuts, so this goes against the standart logia behaviour.
(I'm assuming pica isnt just splitting his arm to avoid the swords)
@sabinis:
She also controls snow in a way same as Pica controls rocks even as she is not in place when snow fence rised.
! http://z.mfcdn.net/store/manga/106/69-686.0/compressed/v010.jpg
yes but with my understanding of logia, if you control this part of the snow strinking there should hurt you.
@RamistaR:
Dunno..for me the assimilation of an element is a very logia like ability. Pretty clear with Ceasar controlling air and ShinoKuni
But to be honest we can hardly say for sure with Oda's portrayal of Logia in general. Anyrway we can enjoy the fight without knowing.
cesar and the oxygen is like crocodile and the water or aokiji and the water.
these seem like additional abilities they get as logia, to manipulate their surrondings. shinokuni is absorbing the element, yes, thats the same as with enel. but they are different in behaviour. enel and cesar couldnt just leave this big body or travel through it like pica, they absorb it.
but you are right about the last part, for all we know this could be how logias behave in solid materials. after all they differ immensely.