Scenario 1: A1 going in for layup, B1 beside A1 going up to block shot, both moving at fast layup speed. B1 slips on floor and knocks A1 off balance, who falls to the floor and is injured. RULING: Intentional foul due to the excessive/ hard contact. It doesn’t matter his intent and/or that he slipped: B1 has responsibility for the contact.