He's not finished with Roman Reigns.
Strowman appeared during the Roman Reigns vs. Samoa Joe matchup, emerging from an ambulance. This allowed Samoa Joe to choke out Strowman's longtime rival. Following the match, Strowman attacked Reigns.
The behemoth didn't stop there. Strowman also challenged Reigns to an Ambulance match at July's WWE Great Balls of Fire PPV.
WWE Great Balls of Fire takes place July 9 from Dallas, Texas. Fightful.com will have full, live coverage of the show.