You're impossible is hardly the worst thing anyone's said to him, especially not when he takes it as an indication that he's winning the discussion. So he neither argues nor confirms it, and instead watches as Prior picks up the flares--it seems he knows what they are--and is about to ask when Prior gets to a question first.

"Yes. I knew him before this place, and plan to see him at earliest opportunity." He isn't entirely impossible, after all. Even if he weren't suffering an entire list of ailments he would want to go see Goodsir, and it's simply an added bonus that he's also a doctor that James trusts.

Not for the first time, he misses Dr. Stanely, but he puts that thought out of his mind immediately.

"What are they?" He asks instead, nodding his head just slightly toward the flares as he fully pulls his coat back on.