#2 He could be injured
The Undertaker is now 54 years old, which means that he doesn't heal from injuries as quickly as he used to so he could have picked up quite a severe neck injury as part of his match with Goldberg when he was dropped as he attempted to take a Jackhammer.
It is unknown who was more at fault in the match since both men botched many of their moves and managed to drop each other, but if The Deadman has injured himself again like he has in so many of his last few matches, it's likely that he will be forced to have a lengthy layoff once again.
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Botches like this should be a wakeup call for The Deadman since he could have injured Goldberg and in return, the WWE Hall of Famer could have injured him, so they should be questioning wether or not they should still be in the ring.