[FlameOn]

Yea that third one next to UN 1 seemed huge. Could also be the actor made a mistake and said kilo instead of mega. Since Ty Frank wrote this episode he's well aware of the science cuz he penned the books.

Spoiler!

A 30m rock should put close to a 5 Megaton blast and what we saw Marco paint and launch in the season 4 finale already looked bigger than that. Looking at Nukemap, a 100 Megaton blast 40km NW of Philly wouldn't even knock out windows in Baltimore and definitely wouldn't cause any physical building damage 100km south of that in Cheasapeake bay where Amos/Peaches are. Maybe just me being nitpicky :P

Fred dying early though, it doesn't really seem like the writers are really rushing to wrap things up. They have a whole season to wrap up to the end of book 6. Maybe it was just to give the Sakai and her betrayal a little more screen time. Who knows?

Regardless Marco's managed to decapitate the heads of the OPA, Mars, and UN all at once. It'll be chaos for the next few episodes.