legal or not?

[BillyMac]

A player may slide on the floor while trying to secure a loose ball until that player’s momentum stops. At that point that player cannot attempt to get up or rollover. A player securing a ball while on the floor cannot attempt to stand up unless that player starts a dribble. A player in this situation may also pass, shoot, or call a timeout. If the player is flat on his or her back, that player may sit up without violating.