First Law of Kenpō

The first law of [kenpō] states that when your opponent charges straight in and attacks, you should use your feet to move your body along a circular path. You should also consider moving your arms in a circular pattern to deflect the oncoming force. When your opponent attacks you in a circular fashion, however, you should respond with a fast linear attack—along a straight line from your weapon to his target. Just as the circle can overcome the line, the line can overcome the circle.

— 10 Kenpo Laws Every Martial Artist Should Know – Black Belt

Thank the gods for the Internet Archive Wayback Machine, else I could not have linked to the source article.