On Saturday, it was revealed that Deadpool director Tim Miller had decided to leave the sequel due to creative differences with star Ryan Reynolds. To call the news a shocker would be an understatement, but what exactly caused the rift that lead to the filmmaker’s departure? After all, Miller played a key role in both getting Deadpool to the big screen and its subsequent success, so why would he walk away from the highly anticipated follow-up?

According to The Wrap, the relationship between Miller and Reynolds has been fairly “contentious” since the release of the first movie. The actor was given approval on casting and other creative decisions for Deadpool 2, and problems between the two arose when it quickly became clear that Miller, “wanted more of a stylised sequel, while the actor placed his focus more on the raunchy comedy style that earned the first movie its R rating.”

Casting also posed a problem as Miller wanted Bloodline star Kyle Chandler to play Cable, while Reynolds was against that decision. The studio ultimately ended up backing the actor, though it’s thought that Miller is now going to end up working on another project for Fox.

Interestingly, Reynolds Tweeted a poll on Friday asking fans where the climactic battle of Deadpool 2 should be set. Both choices were, “A Bridge,” and the fact that’s since been deleted has led to many wondering if he was taking some sort of shot at what Miller wanted.

Who will now take the helm of the Deadpool sequel remains to be seen, but expect the hunt to begin soon. After all, the follow-up is already looking for an actress to play Domino!