#2 Go after the Intercontinental Championship
We should not lose sight of what brought Ambrose back, Rollins' quest to reclaim the Intercontinental Championship. If Rollins wasn't fighting for a title, he likely wouldn't have felt the need to bring back his brother in arms. Ambrose has a history with the Intercontinental Championship himself, as he was the first Shield member to win the title.
Yes Ambrose came back as a Face, and yes he helped Rollins win the title back from Dolph Ziggler, and yes feud over the Intercontinental championship is currently on hold. Ambrose will continue to help Rollins fend off Ziggler and McIntyre, but once that is done, this Face façade can melt away and the Heel within the lunatic can come out.
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Look at the Intercontinental Championship match between Rollins and Ziggler at Summer Slam, after Rollins wins and celebrates in the ring with Ambrose. Ambrose has a look on his face that is hard to describe, something about his demeanor is foreboding. As the camera focuses on Rollins we can see Ambrose pacing in the background, and every time he steps out of the camera's view you felt that he was about to lash out at Rollins right then and there. Ambrose could have helped Rollins win the title, just to take it away himself, just as he did when he cashed in his money in the bank briefcase on Rollins in 2016.