I get your point and I was thinking about this case. After all, it sometimes happens that you get no countdown and also garena is bugged in so many things that I don't want to rely on the fact that you had the "wrong" system message. I totally see no reason for this guy to leave that game. If you had told me there were some flames ingame or whatever, I would have said ok, ban.
In this case I am not sure whether he left or had some error or whatever, but I generally think people are innocent till one can be sure they are not. I know you have provided the SS but the history of this guy is totally clean and his and his team's stats are good.
So I denied it because I think he is innocent.
About your HLR4 problem: I see your point, but I wasn't involved and it doesn't help to punish this guy now. Do you agree that it looks strange that this guy left?