I stand corrected (along with many others here). Along with many others, including coaches, players and announcers, I always thought there was a "pivot foot" when inbounding a ball not after a made shot/FT, but clearly there is not. Having said that, Caleb probably did move outside the 3 foot wide lane the ref had established.
https://sites.google.com/site/stcharlescycrefs/-traveling-out-of-bounds
The bottom line is,
there is no such thing as traveling out of bounds. There is NO pivot foot out of bounds. However, it IS possible for the thrower to be whistled for a violation for
leaving the designated spot. Every throw-in, other than a throw-in following a made field goal or free throw, is a designated spot throw-in.
The DESIGNATED SPOT is defined as a lane 3-feet wide with unlimited depth. As long as the thrower keeps one foot on or over the designated spot, he/she is legal.
Here are the specific rule book and case book citations.
Under Rule 4 (Definitions), section 42, article 6
The designated throw-in spot is 3 feet wide with no depth limitation and is established by the official prior to putting the ball at the thrower's disposal.
NOTE: The thrower must keep one foot on or over the spot until the ball is released. The traveling and dribbling rules are not in effect for a throw-in.