What we have here is a "you done goofed" moment.
spoilers:end of spoilers
Garou is now releasing massive cosmic radiation just by standing there, enough to kill people and threatening to turn the Earth into a dead planet. Blast shows up, they fight, we get to see Blast's cool power-set for the first time. You also find out that Garou IS being possessed partially by God, which is where his powers and motivation come from. Garou adapts Blast's powers and both uses them and counter them mid-fight. Garou pretty much punks Blast, going so far as to say "you might be the number 1 class S, but you are beneath my notice." Garou wants to get Saitama to release more power so he can copy that, because he realizes that Saitama has not released even close to his max so far. Garou kills the crippled Genos and rips out his core. Saitama shows up, looking kind of shocked, Garou tosses him the core, Saitama reflects on some conversations with Genos, then he gets Serious-faced and seriously angry. The issue ends as Saitama launches a Serious Punch, Garou goes Saitama mode and replies in kind, Blast comments that the backwash of this impact will destroy the planet. Impact to arrive next chapter.
EDIT: SORRY for the initial reply, I forgot to close the spoil tag, fortunately nobody read the post before my first edit to close it.