I don't stop my watch for substitution. I add 30 seconds on. Some may disagree with me. Some may not.
Running onto the pitch where I am standing with a quick chat is much quicker than me stopping the game, running over to the halfway line, taking the name, doing the checks, waiting for one on, one off, returning back to position (me and the player) and then restarting the game...
Coming from a 5-4 ref / assessor / mentor / mentor co-ordinator / trainee level 1 tutor............what can I say