Mercury finds herself distracted as they rejoin the others. Did she answer for the best? Will it make things difficult back in Luceti? Is it alright? If he really has that sort of power, will he know Usagi is Sailor Moon as well?

Too many questions. She'll have to keep an eye on Luke. Be sure he can be trusted. She adds that to their mission.

By the time they're back with the others, though, she's acting as though nothing is wrong, only a bit preoccupied, easily explained as concern for the surveillance mission.