Leaving the court

[SperlingPE]

NFHS says "typically" this happens when a player is avoiding a screen. I would like to see a little more explanation of this. Situation earlier this season: Offensive and defensive players standing close to one another along the base line. The offensive player drifts (steps) completely out of bounds. The player does not go anywhere or get involved in the immediate play. I call the violation. My question is this, "Is this a violation like 3 seconds or is it a violation like traveling?" I have heard opinions in both camps from officails that I have worked with. My thought is that some judgement should be used when calling this, but until that is spelled out by someone I will continue to call it as written.