In Firestar's Quest, Fernpaw becomes a warrior with the name of Ferncloud, and Longtail becomes the mentor to Sootpaw. However, Longtail is blinded while hunting a rabbit that turned on him and scratched his eyes, rendering him unable to to hunt or fight properly.

Does longtail go blind?

Longtail was blinded by a rabbit and forced to retire early, but remained valued by the Clan. Longtail formed a close bond with his fellow elders, Mousefur and Purdy, but was killed by a falling tree. He ascended to StarClan and reunited with Mousefur during the battle against the Dark Forest.

Who was Mousefurs mate?

Mousefur welcomes Graystripe back, and upon noticing he's taken Millie as his mate, slyly remarks he's still breaking rules.