No one was really "defending" that, they were kind of busy getting butthurt over the double standard the MC blurted out so readily and went off on a tangent that ended up more or less unrelated to the actual events of the chapter. The girl herself wasn't the one getting outraged over a dude trying to hit her back, for instance. She was pretty much just standing there waiting for it to happen when MC jumped in front.People defending a guy which grabbed the arm of a girl cleary trying the get away from him... I'm speechless...
Probably not, no. This is a common issue in translation from Japanese to English, butHaving started rereading from the start, does he actuallyin the rawscall his brother 'she'