Caitlyn taps Jack's shoulder and points to the left of them a bit away. "Am I continuing seeing things?" She asks wondering if he saw the same little shape of a shadow a bit away. It didn't seem normal to her. So she wanted to be sure she wasn't seeing anything. 
"Alright Doctor. I trust you." Rose said with a smile. She would too. She placed her full trust in him once. She didn't mind doing so again.