Hanuman (on the way to Lanka while he was carrying Sanjivani) had told Bharat that Laxman was in great danger, Sita was kidnapped and Ram was at war with Ravan. Still Bharat and Shatruhgn didn't help Ram.Why?
Bharata was Rama's servant. He wouldnt leave Ayodhya unprotected till Rama asked him to.
By the time he gathered army and went to Lanka, battle would be over.
Taking help from Ayodhya means Rama's oath would be broken as he would be using Ayodhya for his benefit.
I didnot find the part of Bharata and Hanuman meet in Valmiki Ramanaya. Which version of Ramayana is it?