I remember that...There is a fact...That HollyLeaf actually died in the tunnels!! But Fallen leaves give her all his life power to her.So Holyleaf actually come back to life. THAT'S WHY I SHIP THEM NOW QAQ
You might be mistaken because Jayfeather and Lionblaze thought she was dead because the boulders fell. And Fallen Leaves was dead because he talked to Jayfeather and that when Jayfeather was known as 'Jay's Wing' it was told that he never came out of the cave after the flood of the cave.