"Tegan, I'm sorry," the Doctor continued to apologise profusely.
"Sorry? For landing in 1412 instead of the proper year, more than five centuries later? Sorry for failing yet again? You're the worst excuse for a Time Lord ever!" Tegan screamed, somewhat inaccurately, before storming out of the TARDIS.
The Doctor sighed in relief as the door shut behind her. His aching ears deserved a break. In fact, he considered, an extended holiday would be even better. On the heels of this thought, he swiftly entered new coordinates.
Nyssa frowned. "Doctor, what are you doing?"
"Revising the coordinates so that we can get Tegan to the proper year, of course," Adric answered. "Right?"
Pretending not to hear the question, the Doctor hit the dematerialisation switch. Through the still-open viewer, he watched Tegan turn and sprint towards the TARDIS, mouth wide, doubtless in the middle of another ear-piercing harangue. For once, he was grateful the outside audio was out of order.
Tegan faded from sight and the Doctor closed the viewer with a smile.
"Doctor!" Nyssa grabbed his arm. "You can't just abandon Tegan in the wrong century. We have to go back for her."
He patted her hand. "Not to worry. Of course we'll come back, eventually. Remember, we can travel for years yet return just seconds after we left this place. The length of our absence won't make any difference to Tegan, but it certainly will to me!"
Feeling as if a great weight had been lifted off of his shoulders, the Doctor strode out of the console room with his head high. A little of Tegan went a long way!