"I can assure you they don't give a damn," Kostos says, without looking up from what he's returned to dicing. It's very possible that they do give a damn, or may briefly give a damn before realizing that a Venatori doing stretches looks the same as anyone else doing stretches, but Kostos does not give a damn, and he's the important one here. Him and the wisp. It's bobbing around his head now, and when it passes by his vision he says, "Watch him," without otherwise moving at all.