Draw with me~

I don't see how that'd help him. If I had a girlfriend stuck on the other side, I wouldn't want her to cut off her arm. That's just disturbing.

It's symbolising a selfless act. The animation also isn't 'real', I doubt that many people in the real world would cut their arm off like that. Also... if they truly were separated how would she have given him her arm? I'm surprised no one asked that yet. But regardless, it's a sweet animation.