It's obvious Clary has a thing for Jace, and she's probably tired of waiting for him to make a move, so why not be direct about it. It looks like she may very well be asking him how he truly feels about her. Will he be honest?
Alec's not sure what to make of his sister. This is definitely not like her. Perhaps Clary is having an effect on her as well. I wonder how Alec feels about that.
Jace looks like there are a million conflicting emotions flowing through him. Will he tell Clary how he feels? Has he figured out Alec's true feelings towards him yet?
If Valentine started creating shadowhunters or gained control of demons, it would be like Beyonce riding on a dinosaur in the middle of Times Square. People would notice.