Rapid Blitz

 
Prerequisite(s): Bounding Assault, Dodge, Mobility, Spring Attack, Dex 13+, Base Attack Bonus 18+.
 
Benefit: You can designate a third target for your Spring Attack feat. In addition to the second attack you gain from your Bounding Assault feat, you can make a third attack with a -10 penalty.
 
Source: PHB II