If you have to leave a game...
and you say "I have to leave in 5 minutes."
Thank you letting me know. It'll make the tribunal process easier so Rioters can know exactly when you left. Screwing your team over because you didn't have the full 30 minutes to play is reportable. We all know it's not an emergency if you still have 5 minutes to play.
Sincerely, http://gifsec.com/wp-content/uploads/GIF/2014/11/Fuck-you-Guardians-of-the-Galaxy-GIF.gif