Alerted immediately to Christine's arrival by a flashing light on his tablet, Spock's attention was secured when he noted not only the familiar design of her uniform but also the manner in which she spoke. She had attempted to address a 'Scotty', and logical deduction dictated that she was referring to Montgomery Scott, the Enterprise's erstwhile engineer.

"This is Commander Spock," he said, flicking a switch on his own tablet in order to communicate with her more effectively. "You are no longer aboard the Enterprise. You have been transported to a planet known as 'Taxon' by a currently unidentified alien force."

His explanation was clear and abrupt. It did not occur to him to 'cushion the blow'. The sooner the new arrival came to understand her situation, the sooner she would be able to begin the adjustment process.