roll over traveling

[phansen]

NFHS

A1 dives for a loose ball, gains possession while sliding facedown, then turns on his side and passes to a teammate. It was a very fluid, continuous motion. I called a travel because of the roll onto the side. I know he can slide without a travel, but at what point does the roll become a travel. Does he have to completely roll over? Or in my case does a side roll constitute a travel?