SDSU #42 receives pass in the low post and, without dribbling, spins, leaves his feet and attempts a layup. BU #4 comes over in an attempt to block the shot. While SDSU #42 is in the air the ball leaves his hands, he catches it and lands. The L calls an illegal dribble.
BU #4 doesn't appear to have touched the ball but I'm not entirely sure how the ball left SDSU #42's hands...it didn't look like he shot it. He may have lost control on the way up or had it hit him in the head. At any rate, it wasn't an illegal dribble since he never dribbled in the first place.