This is how Brock Lesnar's title reign ended:
Right before the bell rings, Braun's music hits. He cuts a promo saying he knows the history of money in the bank and that he's not a coward, and wants to do things face to face. Therefore, he announces that he will wait and cash in his contract... right after the Brock/Roman match is over. Wut? But hey, they definitely found a way to get the crowd to stay interested in the match!
Brock is distracted by Braun standing outside. Roman, like the babyface/heel/whatever the fuck he is, capitalizes by hitting a series of Superman Punches/Spears that only keep Brock down for a 2 count. Brock eventually powers up DBZ style and starts coming back with the German Suplex rally.
A minute later, the match spills to the outside where Braun is. Brock takes him out with an F5 and some chair shots. He throws the Money in the Bank briefcase up the ramp. As soon as Brock slides back in the ring, Roman sneaks up and catches him with a single Spear. 1-2-3, new champ is crowned, and like a minute later the show fades to black with no mention of Braun and if he can cash in. Fucking brilliant.
So this is how Brock's unstoppable 1.5 year title reign ends, and you could argue that the build goes back even further with the ending of the Streak and the squashing of John Cena at Summerslam (but you probably shouldn't, unless you want to get really depressed). Yet at the same time it seems like nothing of value was lost. Except maybe some of Braun Strowman's credibility. Tune it to Raw tomorrow to see them play up Roman's win as a huge babyface moment.