Idling is worse than being afk what in turn is worse than leaving.
The three things are bannable, you can read it anytime in the rules we maintain (since this is a public place there's scarely space for rules based on skills and because of the same reason the common sense sometimes must be thwarted in order to make fair and appliable rules to everyone).
you were idling from the 38th minute to 45th minute when you just moved in an attempt to kill one of the enemies who were sieging you, and then you went afk for the last two minutes, that period of time is enough to get you banned, no matter how the game was.
As one of your team mates said , if you dont like the game you always can leave but know that idling and being afk are also punishable, end of the talk. Im not going to get into details of how lame or not our rules are, but if you search maximum skill you always can join any league. Keep always in mind that this is a public place.
I hope my answer satisfies you now, or at least I hope you understand it.