Desperation. Anger. Revenge. All loaded conveniently into Teardrop's hands. The glare says it all really. The message he is sending with his eyes is absolute and is not up for interpretation. He knows his brother is dead. He knows who got him that way. And he's willing to die to right that.
It looks like Nathan Fillion might be playing a superhero afterall. After being considered for roles in Green Lantern, and Captain America,Fillion (most remembered as Malcolm Reynolds in the cult-hit Firefly) is reportedly in final negotiations to play Dr. Hank Pym in the new Avengers film. It hasn't been stated whether Pym would be Ant-man in the film, or just a S.H.I.E.L.D. scientist, but we're holding out hope.