User blog comment:Martialmaniac/Uvo's Nen abilities/@comment-4896558-20161105182049/@comment-5780397-20161106104338

As I've also said in my reply to your first comment (writing it twice in case someone else replies), I would agree if Uvo had ever shown any feats of durability wihtout using his aura. Even if he was drugged, he did use aura to resist, and we don't know to what extent it was weakened (if it was), so there is no guarantee it is partly a physical attribute. Kurapika also had every interest to keep him alive, so it's not like he punched him with the intent to kill and Uvo survived.