[Yeah, okay. He doesn't exactly forget that he can't talk, but the importance of that situation slips his mind as Russell continues his end of the pleasant 'conversation'.
Ed opens his mouth to shout at him before realizing the number of reasons that's not going to work.
Have some more sulky glaring, Russell. You're not worth the pen and paper it would take to communicate anything else, and really - who needs it? His point is clearly enough written all over his face.]