Every warning alarm in the TARDIS was going off. The Doctor was sure the Cloister Bell was ringing, but he couldn’t hear it over the din in the console room. Tegan’s confusion was exacerbating Turlough’s fears and they were both yelling questions. Only Nyssa stayed relatively calm as she tried to help him save the ship from crashing.
So many companions but so few crew, he mused distractedly between rushed calculations. He wasn’t sure what he’d do once Nyssa left. Of course that was a moot point until they got the interface stabilizer back, assuming they even survived the landing.