Yeah,' said Ron. 'Could've been worse. Remember those birds she set on me?' 'I still haven't ruled it out,' came Hermione's muffled voice from beneath her blankets, but Harry saw Ron smiling slightly as he pulled his maroon pajamas out of his rucksack.
Some filmmakers don't want to just entertain, to play with the audience like a little ball and then dump them. They want you to be imaginative, and if you're intrigued, the work will grow on you and you're going to build your own interpretation.