Dr. Sloan lifts both of his legs up balancing on his crutches to kick Laird when he's going to shoot him. Even with a broken foot he kicks him hard enough to cause him to fall backward on the table. The Dr. would have been propelled backwards himself if he did this as shown as he was balancing on his crutches. Laird falls back on the table with his head to the right and his feet to the left but when he rolls off to the floor his position is reversed. (head left and feet right) While Dr. Sloan hides Laird (unable to find his gun) grabs a fireplace poker and goes looking for him. Then he wanders out on the porch where the doctor (again with a broken foot) is able to quietly sneak up behind and using the wheel chair run with such speed and force enough to knock him over the railing.