Any team time wasting know they can keep doing it as long as the ref starts pointing to his watch, instead of applying the Laws of the Game and issuing a caution. They know that the time added is never as much as the time wasted, and it continually breaks up the game and lessens the chance of their opponents building up “a head of steam”.

Every time I see a ref indulge in that pathetic reaction of pointing to his watch, I know the game will be awful from that time onwards.
They really ought to be demoted for failing in their most basic duty - to apply the Laws.