Episode 44: "Fierce x Desperate x Fight"
Uvogin relies on raw physical power (Big Bang Impact), while Kurapika uses his "Conjurer" chains to trap and weaken his opponent. Hunter x Hunter 2011 (Dub) Episode 44
Kurapika uses "Chain Jail" to force Uvogin into a state of Zetsu (no aura). He then pierces Uvogin’s heart with "Judgement Chain," setting a rule: Uvogin must answer his questions or die. Episode 44: "Fierce x Desperate x Fight" Uvogin
This episode is often cited as one of the best in the "Yorknew City Arc" because it subverts the typical shonen power creep. Kurapika doesn't win through just "being stronger," but through and a lethal sacrifice (the Nen Vow). It sets the dark, mature tone for the rest of the arc. Hunter x Hunter 2011 (Dub) Episode 44