"Or maybe you're just too fucking oblivious to realise that I am!" There was another shove, the hardest yet, and he stepped in close and tight to ensure she either backed up or fell. Even though his family had never done anything to ostracize him, even after the truth of his adoption had been revealed, Simon still felt like an outsider, that truth just driving a wedge into everything. And it hurt, even here, even though he had her, knew her, knew his sister, he still refused to embrace it.
So he pushed and shoved at her, then finally lashed out with a left hook, putting all of his weight behind it.