EE states EE was assisting to clear a flocculent line when EE noticed that the hose line was starting to move as if it was about to fail. EE states EE abruptly turned to run and shut off the air feeding the line, when EE heard the line pop EE turned back to see the extent of the failure. EE believes when EE abruptly turned one way then back the other EE damaged EE's knee.