The man was startled when he heard Grey's remark. Grey was still fighting with the puppet and he had gotten the advantage over the puppet.
"The array here…"
The man turned his attention to the array set in this place. He knew of the array and was one of the people who even set it up. When he inspected it, his pupils dilated, he couldn't believe Grey worked on the array right under their noses and they couldn't even sense it.
He was thinking about how Grey was able to sneak so close without them being aware, but now he understood the reason, Grey messed up with the array in such a delicate manner that they weren't even able to find out until it was too late.