She's pretty sure the fourth person (or first, depending on how you want to count) isn't an agent. He's wearing a gun, but nonverbals are off, and the way he acts around the mages is off. Something political, would be her guess. Maybe she'll get to find out when they get wherever they're going.
(The other three at the moment are herself, not in field cover, the other mage, who's supposed to translocate them all so she doesn't waste a teleport, and their minder, who's looking between Fourth and them in the way that means she's even more ready to take a shockstick to them than usual.)