A baseless hadith about thinking to oneself in prayer

A man died during an obligatory prayer; should those who are around him exit the prayer because of that?

The imam got up for a third [rak‘ah] in Taraweeh, then added another [rak‘ah] to it, but there was someone behind him who was praying ‘Isha’

Does he interrupt a person’s prayer if he stretches his arm out to pick up something that is in front of the worshipper?

He prayed behind an apostate imam for five years and was aware of his apostasy

They prayed behind someone who did not say the takbeer and tasleem out loud; what is the ruling on their prayer?

Did the Sahaabah (may Allah be pleased with them) fast on the day of Badr?

Is it Sunnah to separate one naafil prayer from another by moving to the first spot or to another spot?

It is mustahabb to separate between the obligatory prayer and the naafil prayer, by speaking or moving

He decided (and formed the intention) to carry on praying on his own because the sound of the imam’s voice was cut off, then the sound was restored, and he found that he had gone ahead of his imam in the prayer. What is the ruling?