Interesting. If plane has commenced descent from FAF but has not yet reached the missed approach altitude (and, for whatever reason, the runway is blocked) I tend to say "stop descent at xxxx ft" plus the reason. This is because I don't want the pilot to hit TOGA button and sky-rocket upwards. If they hit TOGA button before the missed approach altitude when will they level off? Your guess is as good as mine! Anyone have experience of this? What will your aircraft do?
Below the missed approach altitude I say "go-around" every time.
(I use the same criteria to determine if the flight was a "missed approach" or a re-position.)