I just realized something about Tsunade
People automatically assume that real world logic appiles to her, like she can get beheaded easily and that even if she does send chakra to her feet, Kaumi and Deva path abilities can either rip her apart and suck her in or push her, but she has feats to prove otherwise.
Can't provide scans on iPad.
In chapter 562 page # 6
Maibu tells her that she will be ripped to shreds and her flesh will pill from her face, only those with skin as strong as steel, and blood of iron. Tsunade survived that with minor injuries. Notice how the average person body would've been ripped apart, Tsunade durability must be on the level of the Raikage + her healing ability.
Dont forget she was born of two strong bodies clans, so what I'm am trying to say is that his body is far more stronger than others, and normal things shouldn't apply to her, for example...being crushed, or not being able to resist gravity manipulation jutsu