Second Turtle following First Turtle, but from a Distance

[John Kendall <kendall@xxxxxxxxxxxxxxx>]

Hi, Everyone,

I'm teaching a summer school class of 6th, 7th and 8th graders, using  
MicroWorlds.
Two of my students are creating an animation with the gym background,  
and two of the basketball playing shapes for two turtles (first  
turtle is named "bbof" for "basketball offense" and the second turtle  
is named "bbdf" for "basketball defense").
They want the offensive basketball turtle to drive towards the basket  
while dribbling the ball, and attempt to make a "lay up."  They also  
want the defensive basketball turtle to follow the first player, but  
can't "touch" it, because that would be a foul in the actual game.
The "How do I make a turtle move to touch another turtle?" (http:// 
mia.openworldlearning.org/howdoi/rns.htm) in the "How Do I?" section  
of the OWL / MIA web site helps explain one turtle pointing towards  
another turtle, but we don't want our defensive player to land "on"  
the first one.  Is there a "plus" or "minus" bit of code which would  
help adapt my students' animation?  I'm not good with the math part,  
but I keep thinking it wouldn't be hard to adjust.
John Kendall
Rutgers Preparatory School
Somerset, New Jersey