It was... whenever they showed Anita with her faceplate obscured, I was sure to check her communication device, and every time it was glowing steadily indicating she was still alive. And it continued to do so right up to and including the shot when the Doctor announced that Anita was dead. The next shot was of the communication device, with it blinking weakly even though it had been strong and steady in the very previous shot.
Other than that, it was excellent. Why can't Doctor Who be like that every week?!
Although admittedly the trailer for next week looks good...