If the ma'mum (one praying behind the imam) precedes the imam in a pillar, such as bowing, what does he do?

Question : So what does he do in that case?

Answer : We say he restarts the prayer; he invalidates what he did beforehand and begins the prayer anew, entering the prayer anew. Yes. If he completed the prayer, it is obligatory for him to repeat the entire prayer, because this prayer was invalid and does not become valid.