Mark's eyes flick between Arthur's for a beat, before he quietly says: "... I see." And then his gaze darts to the clock on the wall, and he seems torn between relief and hesitance abruptly.

"I really don't want to cut this short - I swear - but I've got a briefing today to get to." He turns an apologetic expression to Arthur.

"But... thank you." The words seem layered with an amount of gratitude that hardly seems proportional to what Arthur offered. "Really."