On the putting green, players should not stand on another player's line of putt or when he is making a stroke, cast a shadow over his line of putt.
Players should remain on or close to the putting green until all other players in the group have holed out.
Scoring
In stroke play, a player who is acting as a marker should, if necessary, on the way to the next tee, check the score with the player concerned and record it.