Talk:Roshi VS Jiraiya/@comment-31068055-20181108005452

So i've only watched the Dragon Ball Super ANIME and not the manga but what is this UI feat of Roshis i'm hearing people say? Like i kinda doubt that Roshi can just go UI but i think i might of heard somewhere that Roshi like took a hit or blocked a punch from Jiren or something. Mind someone clarifying this for me?