It looks like something bad has happened to Simon, and with Raphael there, it can only mean one thing. Hopefully, whatever Clary is doing will work. And look at Jace's face. He seems genuinely concerned, but maybe it's all for show!
Valentine sure knows how to take care of his experiments. Wouldn't want his Zombie Freak to get hurt, thus the kneepads. What a good psychopath Valentine is. I hope Hodge can take this thing down!
Clary: Simon, how could someone as smart and perceptive as you not realize the person sitting right there is in love with you? Simon: I guarantee you I'm not the only smart, perceptive person to make that mistake.