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Does this work? (Discussed as viewed by the thrower.) The ball is
spinning clockwise meaning it has forward directed angular momentum.
As
it arrives at the top of its flight it has a positive angle of attack.
This results in some circulation
which means the air acquires some
rightward angular momentum.
This means the ball gains some leftward
angular moment which, with its big roughly forward angular momentum,
means it yaws left. This results in some leftward lift and its
associated circulation which means the air acquires some upward angular
momentum. This means the ball gains some downward angular momentum
which, with its big roughly forward angular momentum means it pitches
downward.