Spotter: Once the kayaker places the kayak paddle on your side of the kayak, grab the paddle with both hands and rotate it around, perpendicular to the kayak. Attempt to get one end of the paddle as far over the bottom of the kayak as you can. This will position the kayak paddle so that the person can attempt the kayak roll.
Kayaker: Allow your spotter to rotate and move your kayak paddle into position. Don't fight it. Stay tucked and keep your head up against your shoulder.