"But you..." Tim doesn't trail off so much as realize that he doesn't know where he meant the sentence to go. Two people means that they want you to fight, but one person only has a 190 degree field of vision. Two people on a stakeout means you can trade naps; one person runs himself into the ground.

Come to think of it, Bruce is looking a little rough around the edges. It's so completely expected that Tim hadn't even registered the fact earlier. "Why didn't you stick with Barbara?

" I mean," he back pedals slightly, trying and failing to sound less accusatory, "you know I don't mind working as a pair, but you're just leaving her to fend for herself?"