That's a Travel
How many times have you ever called a travel and done so merely because "that didn't look right," or "that looked funny."
It's happened to all of us. Every basketball official has been there, done that. While traveling is likely the most common ruling (it happens on every play), it's also the most misunderstood and misapplied. It takes time, attention and a complete understanding of the rules before you ever have a chance at navigating what's legal and illegal as it relates to the pivot foot, jump stop, dribble and movement. That's a Travel breaks it down for you like no one ever has before.
So stop "guessing" and start learning how to "know it when you see it."