Alissa I am creepin' on your thread! (Too lazy to start my own...)
Toby was too busy setting up equipment to notice Jack talking to Sarah until it was too late. He made a choice to just trust Jack and finished up his work before taking his place on the couch. It didn't take him two seconds to realize Sarah seemed about ten times more nervous than she did when she walked in.
He shot Jack a look, not that he noticed, or that it mattered. It was the thought that counted. He gave Sarah a very concerned look, "Hey, is everything ok?"