Why doesn't champ select stop when "Summoner has left the room"?

A few minutes ago, I had to deal with an annoying game of 4v5 where our Lucian never connected. The thing that bothered me the most about this was that while we were in champ select, the chat CLEARLY stated that "xxxx has left the room". Shouldn't champ select automatically close out then? I find it extremely stupid that we had to waste 20 mins just because none of us wanted to lose lp and dodge.