Quick to cotton on, Alex immeadiatly assumed that Yindi must have encountered Jack before and not a pleasant encounter at that. From what Alex had seen of Jack it wasn't exactly hard to imagine. He was, well, an acquired taste. And while Alex hadn't acquired it, he was laid back enough to tolerate it and even humour the little guy.
Alex had considered making a joke about Ally before he heard the 'green' part, confirming that Jack was indeed the point of contention. "Oh, that's Jack," Alex replied with a shrug. He opened his mouth to add some more before realising that was all he really knew about the little green man. He supposed he knew that he generally seemed to be around Kitty or Kurt but that didn't really seem to be helpful information to give.