To intentionally hit a low hook, like the clutch recovery James Mason played from the woods at Sunday, you need to modify three things from a regular swing: the address, club selection and arm rotation.
Use a more lofted club because the low-hook swing delofts the club face, meaning your seven-iron will fly like a six. ADDRESS: Place the front foot perpendicular to the target and the back foot at a 30-degree angle This creates more turn in the back-swing, so you can attack the inside part of the ball on the downswing and create hook spin. ARM ROTATION: Don't make the common error of trying to shape the shot with the rotation of your body. Use your arms. To learn correct arm rotation, imagine your hands are on a steering wheel. Through impact, pretend you're rolling the right hand over the left (3). Finally, finish as low as possible—at or below waist level—to keep the ball down. This handy recovery shot takes some practice. No doubt Mason perfected his during all those years on the range.