Statement I : A spinning cricket ball deviates from its trajectory as it moves through air.
Statement II : While spinning the ball is moving forward and relative to it the air is moving backward.
A spinning ball deviates from its parabolic trajectory as it moves through air. Suppose ball is moving in forward direction and air is moving in backward relative to ball. Due to this there is dynamic lift on the ball and ball deviates from its parabolic trajectory.