the tongan number eight , who has been warned in the past over his ill-discipline , halted pearce in his tracks with a shoulder charge and left him prone on the ground .
after studying replays on the screen , referee tim wigglesworth showed hala'ufia a yellow card and then changed it to red after he had seen him shove pearce 's head into the ground .
hala'ufia halted laurence pearce with a shoulder charge and then shoved his head into the turf .