I understand this exact situation as I made a line check as Captain with a older FO I had flown with in a previous company and who I’d recommended to his New company. The examiner being on the jump seat. It was 4 sector trip. It was very hard for me to take control but that’s what I did for his first two landing at 50’ pushing lots of thrust and lowering the pitch to recover the landing. We have to have a final gate that we must not pass where a safe recovery can me made. I feel sorry for the first officer, and also for the Captain who knew if he took the controls it was then end for the FO