EE WAS HELPING A MINER LIFT UP A PLUGGER AFTER THE MINER HAD FINISHED DRILLING A 4 FOOT HOLE. THE EE HAD HIS RIGHT FOOT ON A 2X4 SUPPORT THAT WAS LAYING ON THE 2 INCH SIDE. WHILE PULLING THE PLUGGER OUT OF THE HOLE THE EE'S FOOT SLIPPED OFF THE 2X4. THE EE STATED THAT HE FELT A POP IN HIS RIGHT KNEE.