Question about an inbounds pass on the baseline

[canuckrefguy]

I checked out sections of the NCAA book on throw-ins, out-of-bounds and the throw-in, travelling, and violations.

The only movement-related restrictions on the thrower in the situation you outlined are that they cannot leave the designated spot, and they may not step into the playing court. You can stand on your head to throw-in as long as you don't leave from the designated spot.

Not sure what that official was thinking.