User blog comment:HunterxPhantom/Chrollo's Stolen Abilities/@comment-26566783-20160727041243/@comment-25657023-20160729181600

Well, even if Skill Hunter takes away someone's Nen, it doesn't necessarily mean that it takes everything, just a portion of it. That's why I used a blood transfusion as an example for how it may work, since our blood is vital, and yet you don't die just from losing a part of it.

But maybe you're right in one point, since as you said, it would be easy for someone to relearn they're stolen Hatsu, so I tought that Skill Hunter may do something like Kurapika's Judgement Chain, being able to restrain someone from creating any Hatsu similar to the one this person had before.