Armin smiled and nodded at Eren. "Do it...."

Eren smirked, biting down hard on his thumb, and this happens : http://www.youtube.com/watch?feature=player_detailpage&v=x2ErcYdU8KY#t=140 (go to 2:20 and he looks like the picture in his CS btw, not the one in the vid)

Levi laughed a bit. "Behold....."

Eren roared, glaring down at Erika.