#2 The match ends in a No-Contest

Another easy way to protect both men and keep them looking strong is having the match simply end without a fall. It happened on an episode of Raw when Strowman and the Big Show fought in the main event. The ring imploded after Strowman super-plexed Big Show from the top rope.
Some sort of spectacle could be in store to shock the crowd, and something like the stunt between Show and Strowman would certainly do that. I know Lashley isn't nearly the size of the Big Show, but maybe Strowman power slams 'the Almighty' through an announce table.
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Or the men could cause destruction to the ring, forcing the match to stop. The outcome of the match, like most outcomes, is dependent upon if this feud is to continue through Super ShowDown. If it is, a non-finish is certainly a route that could be taken. It would not only prolong the feud but give each man a reason to keep fighting.