".... Uh.... Hey look at all these neat new pointless characters hogging panels and reacting to GREAT HOLY NIKA!" - LOda.
Seriously though, same place where Usopp's CoO haki went. Or Nami's supernatural ability to predict the weather. Or Zoro's Enbima Yonezu. Or Franky's real time master carpentry that let him build stairs in midair.
Wtf is Oda smoking? Also you're telling me Luffy couldn't even use that kind of internal haki bs to hurt Warcury from the inside when external attacks clearly weren't working?
Oda's sales are dipping and he has no one to blame but himself.