Should HAVE left the pitch, should've is an abbreviation of "should have", not "should of". One of my most hated grammatical errors.
Hung won't be seen for days now as he re-reads 1559 of Charlie Dogscock's posts in the hope of any spelling or grammatical mistake.
I think the ref should have spoken to the goalkeeper and told him and the manager that if he didnt leave the pitch within 30secs he would be sent off. Its now highlighted another method of wasting time associated with substitutions. Always annoys me when players spend 30secs leaving the pitch while shaking hands with all the players and match officials while ambling slowly towards the sideline.