When you take a perspective outside time, you have to be careful not to let your old, timeful intuitions run wild in the absence of their subject matter. In the Block Universe, the future is not determined before you make your choice. "Before" is a timeful word. Once you descend so far as to start talking about time, then, of course, the future comes "after" the past, not "before" it.
One must avoid mixing up timeless and timeful thinking. E.g., trying to have "Determinism" acting on things before they happen. Determinism is a timeless viewpoint, so it doesn't mix well with words like "before".