Do you mind being more precise ? I mean, you make it sound like he defeated a fodder so no I don't remember to be honest.
And how exactly was he hyped ? Is this because of that scene with Hisoka's dolls ?
Beyond came back alone from the DC and went back because he gathered a team of various specialists. Not sure that their hatsu is of the specialist kind, but from what I can recall the temp hunters have been chosen for their abilities. I doubt they're all top notch fighters. But there seems to be more of the Dark Continent than Meruem like foes.
There are many mysteries surrounding this ship, so I'm not worried about coming back to the known world. For instance there seems to be a yacht at the top of the ship. Togashi could introduce whatever plot or nen device at this time. But I don't believe that fleeing back to the known world is an option. It's been made clear that the succession war will result in one single survivor. If this do not happen, Togashi will have to bring up solid shenanigans of nen. And despite that, I believe that the new King (or Tserriednich) will try to colonize the Dark Continent.
I basically just want our initial expectations to be defied by Togashi. Killing characters is ok, but sinking the whole ship in order to erase all the new characters from the story is a bit lazy from a writing perspective. Especially when everyone can see this coming.
let's get it
HxH greatness continues 
