You are allowed to not play an arena match and let them beat you, or leave for an instant loss.
Just join the game then leave, you will get your loss in about 60 seconds, and the other team gets an insta-win.
Anyway you can also join and just sit there, Arena isn't like BG where you can't control your part ymembers, if the other team members didn't *want* you to afk, they would remove you from the team and you would never be able to play with them again.
I have done this before when I didn't have enough time to play and had to do 10 games real fast at 2 AM on a Monday a few hours before the servers go down. Lazy or not, sometimes you gotta do what you gotta do. I doubt the opponents care, free points.
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