Dominic turns to respond to the girl Cadet but before he could say anything the crowd formed around them so he just continued waiting for Casey,  from a slightly further point away to separate him from the crowd. While also keeping an eye on the crowd being his normal Paranoid self looking for anyone who sticks out in crowd, or looks like someone who could pose a threat. Even those no one could pose a threat to Casey and the other agents at the building. He learned with his family's death to never let his guard down ever again.