An old photo of Shinpo Matayoshi. So much for our throwing sai at the ground.
This reminds me of Sherman Harrill discussing that originally the sai throw in Kusanku Sai was into the body of the opponent, not thrown into the foot. The change was due to too many bodies in the dojo to toss the sai safely.
Charles Murray also experienced this at a Goju dojo on Okinawa which he visited when he was there in 1972