[Oh, did I mention he's wearing a ninja outfit yet? He's wearing a ninja outfit.]

Yosh! You won't escape Nico Robin! This technique will definitely finish you off without fail this time! [He sounds completely serious too. Well serious-ish. He doesn't have a mean tone, but he does seem to have faith in his words.]

Speed of a Rabbit Bear! [He moves so fast that he essentially disappears, before ending up next to Robin, poking at her forehead.] Omae wa mou... shindeiru!