@ultimatehaki
around chapter 80, SJ stated that Yakusoku no Neverland was on it's "turnaround" point
which they generally use when a manga is halfway done, so assuming they dont make it go longer ( which by all means, they can, this is SJ and we know how they make use of their popular series ) it should end around chapter 150-170
I was thinking that the threat was that he had to bring back the bodies back (as proof he didn't just shoot them) or she'd blow the place... which would make for a really awkward return.
'We just rescued an entire colony-- *click* Aw...'