Joining a person performing Salaah alone
Q: If a person is busy reading Salaah alone, then another person comes and joins him to make jamaat. Is this action ok? What should the first person do in this case?
He does not have to do anything. If he intends himself being the imaam then if it is a jahri (audible) namaaz he should read aloud.
And Allah Ta’ala (الله تعالى) knows best.