In chapter 398 we can see how Robin has enough energy to stand straight, walk around, tell a long story and shout across the ravine, despite being handcuffed with Seastone handcuffs.

![enter image description here](https://i.stack.imgur.com/bNdsbm.jpg)

While in chapter 730 we can see how Luffy becomes completely immobilized after touching the bars of the Colosseum.

![enter image description here](https://i.stack.imgur.com/C8wMsm.png)

Where does Robin get all this energy from? How come her energy isn't completely drained as it was with Luffy's?