Zero Rotation "Projapoti": using a special grip & release method it is possible to bowl the ball with little or no rotation. This causes changes in air pressure around the surface of the ball (similar to the physics of reverse swing) causing it to behave erratically during flight. Due to its unique movements it was christened the "Projapoti" or "Butterfly Ball" by its inventors Julien Fountain - Specialist Fielding Coach & Ian Pont - Specialist Bowling Coach[1],[2]
Means, when ball starts flying due to butter ... Specially when the ball slips out of hand due to buttery hands... You produce these deliveries... condition is generally perfect immediately after breakfast and lunch.....