Nothing says crushing more than the old man who has a physical and mental bond to you getting upset about the apple of your eye getting a little bit of attention from another potential suitor. But thats exactly what we saw here with Jax. With Jefferson suddenly developing a crush on Kendra, its actually Stein who feels himself getting angered by Hawkgirl enjoying some flirtatious fun with Ray Palmer. In fact, Stein even snaps and asks for some professionalism from these flirting friends before he then realises that hes getting all hot and bothered purely because Jax has some feelings for Miss Saunders. Of course, if this is what happens just from Jefferson having a crush on Kendra, Ill leave it to the imagination what would happen to Stein should Jax actually ever seal the deal with Hawkgirl.