EE WENT ON TOP OF QB FILTER AND SAW THAT THE 1B FILTER CLOTH HAD WALKED OFF THE DRUM. HE WAS PULLING THE CLOTH OVER TO GET IT BACK ON THE DRUM WHEN HE FELT A SHARP PAIN IN HIS LT. SHOULDER. EE LET HIS SUPERVISOR KNOW & WAS INSTRUCTED TO STAY OVER AND SEE THE NURSE AT 7:30AM.