I don't think Garou's punch made Saitama bleed. These black particles are often just an indication of impact.
As for the chapter, great fight, excellent art. Dunno why people see the Manga as ruined. In the web comic, Garou's limiter also started to crack and here, he additionally became God's avatar basically. The narrative of the comics wasn't that Saitama will never meet a guy that will push him harder. After all, Boros also was an exception to the usual monsters, as he pushed Saitama further, and he was introduced pretty early in the story. Did people think that in the entirety of the manga/comic, a season 1 vilian will be the toughest one Saitama could've encountered?
And even here, Saitama isn't that serious. Basically fighting with one arm and still overwhelming.