I agree, it depends on how well you know the person. If it is a close friend, I would talk to him and let him know it was not cool and the effect it had on both of you.
If it is a casual acquaintance, I would let it slide. Finish the league and move on. I would talk to the other bowler who did stay and let him know your feelings on the subject. He may have thought you were in on it and approved the actions of the third member.
I must admit there have been nights I have been so off my game, I was tempted to leave and let my team get my absent score. I never did leave. I only have quit when I truly was ill, and that's only been once in 28 years. I went to urgent care and had extremely low blood pressure. They nrver did find the cause and it has never happened again.
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"I cannot change the direction of the wind but I can adjust my sails to reach my destination." Jimmy Dean