I Wouldn't Tell A Lie ⌚

Fritz got a new watch for his birthday and he showed it proudly to his friends. He timed them all running and then Fritz’s decided he wanted to see how long it would take to climb a nearby mountain. His friend Monty said he will go with him. When Fritz was taking a nap, after their swim, Monty was looking at Fritz’s new watch when something happened. Should Monty tell Fritz what really happened?