The stunt did not call for just gaining enough speed on the motorcycle to catch up with the plane in flight, which alone would be pretty impressive. The pilot had to fly inverted and incredibly close to the ground. One wrong move and he would have plowed right into the earth, taking him and his brother out in a ball of glorious fire. The brother riding on the Honda CBR 600 F4i had to trust the pilot since a sudden slowdown of the plane could have caused him to barrel straight into a sandwich of sharp metal. And then there was the act of grabbing the plane’s tail, which as you can see in the video caused the vertical stabilizer to move within inches of the runway’s surface.
With only a few feet allowed for any error, the motorcycle rider had to know just how long to hold on. The pilot also had to know just how long to wait before pulling away from the ground, otherwise his brother would have been launched high into the air and become a little spot of grease on the runway, safety gear be damned. While the brother on the motorcycle was cheating death a few times, the one in the biplane was cheating death only a few dozen times. To be able to fly a plane inverted that low to the ground takes nerves of steel, and then to react appropriately to someone grabbing the tail and pitching the craft upward toward the ground goes well beyond what any normal human being can handle without seriously soiling their shorts.