#2 Both seemed miserable during their final days
While talking with Cabana on his podcast, Punk said that his wrestling career was a failure and he didn't love it anymore. He was one of the most popular wrestlers on the indie scene at one time, but his WWE run changed everything. The creative differences and the constant pain his body endured was enough to make him unhappy to the extent that he refused to go on and beat Triple H at 'Mania that year, and instead opted to leave.
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Moxley's situation isn't any different. one look at him during his final days in WWE is enough for a fan to realize that he was just waiting for his contract to expire. Every time he came out for those Shield reunions, his face lacked the kind of emotion and intensity the WWE Universe had become accustomed to.