This may just be my personal aha moment, but when examining the QRS I realized that the "Control Pursuit" prompted action is only listed for the fighting phase - there apparently is no control pursuit option available if you manage to charge and break the enemy - you will always merrily charge right over the top and into whatever is beyond?
Probably doesn't happen all that often anyway - although my kniggets did it recently (but having CL/DC they can't control pursuits anyway).
It probably has something to do with the momentum and adrenaline of the charge carrying the victors through?