Leaving the court

[RefTip]

I just got home from watching a varsity game and wanted to be sure I was correct with this rule . We were watching boys Varsity ball and our player went out of bounds going after the ball( out of bound slightly ) . He came back in to go after the ball and the official blew the whistle and indicated it was the other teams' ball. Our Varsity girls coach ( sitting next to me ) asked me if that was correct and I said I thought they had to leave intentionally ( to avoid a screen ). The official was very consistent with this call because he called it on the other team as well ( he made 4 of these calls during the game ) . The Girls Varsity coach left with my interpretation of the rule ( he thought the same ; the rule was in place for players going out of bounds to use a screen ) . I want to be sure I have it correct . Any help is appreciated .

Thanks