The Elders' Concern is a warriors short story found on the Warriors App. It is about the elders of ThunderClan debating whether or not Fireheart should have become deputy and if his deputy ceremony was a bad omen.
There are continuity errors in this passage. They state that Fireheart became deputy though Lionheart was the spirit watching over. This is a major error. It goes against many important things in that series. Lionheart died in book one and Tigerclaw became deputy and Fireheart did not even become deputy after Tigerclaw died because he didn't die, he was exiled. And if this were going according to the books they wouldn't mention Lionheart approving because they say it is the deputy before the last that approves, this makes fans believe that it is not official.