In the webcomic, Sweet Mask turned out to be a monster with the heart of a hero, getting Saitama's approval ("You're cool."). The way this chapter was originally, that would've been somewhat of a plothole, given that slaughtering the mercenaries would've been an extremely "un-Saitama" thing to do, and would certainly have earned a face full of fist from him if he were to learn about it. With the revision, Sweet Mask's character has been revised to fit the webcomic. While manga-exclusive readers are still led to believe he's evil in disguise, he didn't actually get a chance to unequivocally show that to be the case. Instead, we get to see him struggle with his monster urges, which he fully admitted was the case to Saitama.