Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

In Mission: Impossible - Fallout (2018), Ethan Hunt's team already strap a tracker block on Lane's neck which makes the tracker device to show "no signal". Why did Hunt's team set a 90 seconds limit to take out the tracker from Lane's neck?
Why did Hunt's team set a 90 seconds limit to take out the tracker from Lane's neck?

In The Revenant (2015), there's a scene where Leo finds fish in the river and the fish is trapped in rocks which are arranged in a U shape on the side of the river. So did someone arrange the rocks in a U shape or were they natural arranged?
Did someone arrange rocks in a U shape?

How did Fred Madison change into Pete Dayton in prison in Lost Highway?
How did Fred Madison change into Pete Dayton in prison?