The Spectre needs to ditch “Percival Pop, Super Cop”, his newly introduced (at the time) comic relief sidekick. So he puts him safely out of the way.

Aside from the insane issues of scale, or the fact that Percival is breathing in outer space, or that the Spectre seems to be able to travel millions of light years in seconds… how about those rings?
Sorry, but pretty sure the world knew planetary rings weren’t solid since like, the 1890s.
Oh, and just to bring home what a jerk the Spectre is to his “friends”:

The kicker here is when you remember (as the writers sometimes forgot at the time) that Jim Corrigan was a ghost. He didn’t need to sleep.
He just wanted to ditch the wannabe.