User blog comment:Leathercock/The most dangerous one of them all/@comment-4928331-20120915144526/@comment-4928331-20120915145311

Well, in covert operations, the less people that know, the better. Especially if the other team has a telepath (Psimon) on their side. I have a feeling Kid Flash was only informed about Aqualad's deep-cover mission only when Nightwing asked Artemis to join Kaldur in the mission.

That aside, Superboy and Miss Martian have always worn their emotions in their sleeves. It can be very hard for them to play-act being sad if they know Artemis was really alive.