There's probably some educational stipulation that she needs to actually set it off in order for it to be credited by Chris as 'a legitimate science experiment the tutee preformed.' And if the side effect is getting a dose of magic with her science, well, Eileen's far from complaining.

Her head perks toward the late addition, runs briefly through names but can't quite focus with the burgeoning need to... do science. So she'll settle for an actually quite pleased smile and little wave.

"Did you want to see it before we sent it off?"

Because if Elisha's not concerned, there's nothing in the world to be concerned about. Except the countdown.