User blog comment:Goregutz619/HXH episode 121 discussion/@comment-48285-20140319180432/@comment-10145707-20140321143123

I asked her about it. She said that alot of Japanese blogs have lots of speculations on it and there's some doujinshi about it too.

"the basic meaning is "double suicide", with a heavy nuance of "lover's suicide", as in two people who love each other commiting suicide together. So taking that nuance into account, it's pretty obvious that Killua is referring to Gon and himself, not Gon and Pitou. As in, Gon will insist to fight Pitou no matter what, so all Killua can do is help Gon as good as he can, and in the worst case they'll lose to Pitou and both get killed. "  That's what she said.

Then it means that the subs were wrong, right?