All of this assumes you perceive a problem. The problem might not have become apparent until too close to downward vertical. By then it is too late. Pilots are 'mission orientated' individuals. Complete the mission. This is the root cause of 'press-on-itis or get home-itis'. It might take a high level of currency, familiarity & relaxation thus sharp SA to 'feel' it was all a bit stodgy and not worth continuing as you neared the apex: and have an escape route planned.
I still think the A27 ground line might have been a magnet on which the manoeuvre was orientated.