There is a narration by Hadhrat Ali رضي الله عنه where he says "When the Imam is hungry, feed him."
(to the nearest meaning)
What can that mean, must WE feed the Imam when ever he is hungry? Is it our responsibility for feeding the Imams.
No, it means, if the Imam makes an error in his recitation during the Salah, we must correct his mistakes.
SubhanAllah, what a metaphor. This is why we need scholars to deduce rulings from Hadith. It is not upto us to come to any form of conclusion as we will make huge errors.
The Sahaba were the masters of the Arabic language and knew what they were talking about and understood the context behind it. This was then taught to the followers of the Sahaba.
There is also another narration from the Prophet SAW about those who will come and narrate and preserve Hadith, but those who narrate will not be able to deduce rules from it. So we have great Imams like Abu Hanifa who was capable of deducing such rules from Quran and Hadith, and we had Imams such as Imam Bukhari who narrated thousands of Hadith but was unable to deduce rulings from them. We know this because Imam Bukhari's student, Imam Tirmidhi would narrate Hadith from Imam Bukhari but conclude that this was the opinion of such and such Imam, mostly Imam Shafi'.
So please don't just pick up a book of Hadith and start taking your own understanding. You WILL be mislead. This needs to be done with the aid of qualified scholars or by scholars only.