Bruce studies him in silence. He doubts Stiles is that easily confused equally as much as he doubts the first call was a fluke. Is he honestly trying to test Bruce in return? The thought's an amusing one.

"Wrong on both counts. But you knew that already."

The mistake, of course, was in the fact that Stiles chose to butter up any reason Bruce might have for 'showing off' his control. He has no cause to do so, he's well aware of how perfect he drives himself to be in all the physical arts he plies himself to. He has to be perfect. To be otherwise gets people killed.