[OHBBREF]

Rule 10 Fouls and Penalties
Section 6 Contact ART. 2 . . . A dribbler shall not charge into nor contact an opponent in his/her path nor attempt to dribble between two opponents or between an opponent and a boundary, unless the space is such as to provide a reasonable chance for him or her to go through without contact. If a dribbler, without contact, sufficiently passes an opponent to have head and shoulders in advance of that opponent, the greater responsibility for subsequent contact is on the opponent. If a dribbler in his/her progress is moving in a straight-line path, he/she may not be crowded out of that path, but if an opponent is able to legally obtain a defensive position in that path, the dribbler must avoid contact by changing direction or ending his/her dribble.

That is the FED from last year I think but I am stuck on the term legally obtain a defensive position. you can not be legal if your foot is on the line. So unless the dribbler put his head down and go out his jousting lance and ran this defender over, the call has to be a block becuase the defender is not legal.
The NCAA wording is virtually identical.