His prayer is invalid due timbering this late!

A person praying behind the Imam had to recite Surah Al-Faatihah slowly (he has a sore throat) and could not finish it until, say, the Imam started to go into Sujud. If the person did Ruku, then stand up, (doing everything that’s obligatory and did not ‘touch and go’) and then caught the Imam in Sujud, can he just continue praying behind the Imam as normal without having to do anything else?

Prayer | October 10, 2015 3:31 am
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At time of isha prayer, dinner is served, but a person or two is not hungry and wants to pray first, also the wife wants to come along with the husband to the masjid. Is it correct if they pray first then come and eat or was it wrong for them to leave dinner which served and go pray, also if the wife wants to come to the masjid with the husband, can she be refused to come to the masjid?
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during the azaan when we say hayyalasalah then we make turn to right side and for hayyalalfalah we make turn to left side . Is it sunnah?