Fionn was aware of the call a split second before it came in (the connection being forced to route through his wetware), so when Johnny looked around to the group Fionn just gave him a nod, and gestured toward his ear to indicate that he was going to be listening in.
If anyone had been expecting a call, gotta assume they'd have kept the link on them... When Clem came up on the camera feed, he decided to cut in, his icon appearing on both ends of the call.
"Hey mate, calm down a second. We've been stuck with this guy we're on last name basis with for a bit who went off to meet a friend of his to pick something up; Clem, the one you've got tied up there, went with him. Wouldn't be surprised if the guy saw something shiny and got distracted shooting at it... But either way he's not here. If you're the guy he was going to meet, I gotta figure he's not too far from ya seeing as Clem wouldn't of known where you were." He paused to let the guy on the other end respond.
And I am so saving that picture...