THE MINER WAS WORKING FROM A PADDLE BOAT INSTALLING A 8""JET SLEEVE ONTO AN 8""PIPE. HIS FOOTING WAS UNSTABLE & WHEN HE LIFTED ON THE RUBBER SLEEVE HE RELEASED A BIND THAT IT WAS IN & THE SLEEVE JERKED AWAY FROM HIM. HE SAID HE HEARD A LOUD POP IN HIS RT. ARM & NOTICED A BULGE ON THE LOWER END OF HIS BICEP.