#1 Black gets disqualified

This is a strong possibility and an easy way to get the feud to keep going. They could provide a good series of matches depending on their chemistry with each other. While Black literally asked for someone to knock on his door, he might get more than he bargained for with Murphy.
The former Cruiserweight Champion is still somewhat of an unknown to casual members of the WWE Universe who might not have watched NXT or 205 Live. It's a mistake to think that way because Murphy literally stole the show during his series of interactions and matches during his involvement in the Roman Reigns attacker storyline.
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Murphy seems like he has no problem getting under people's skin and he even claimed that Black "needs to calm down." He might just be saying that and he completely intends to push Black to the point where the Dutch Destroyer crosses a line and gets disqualified. It could be intentional or unintentional, but to continue the feud, I could easily see Murphy get under the former NXT Champ's skin in order to prolong the feud.