Just after going through the door Igor does a head count. One shy. Where is sienna? Was she sneaking off? Was she betraying them? Igor perks out of the door to spot Sienna just disappearing through a different door. He dashes back to Victor and tugs on his sleeve, pointing back and whispering Sienna went that way!
Azeban walks up to the first door and presses his ear up to it, trying to find if that was the source of the noise, and to see if there's more to be learned before busting in.
Farash moves past the listening Azeban to the furthest door, reading the plaques as he does so. He then listens at the far door... hearing absolutely nothing.