5. Fielder absent or leaving the field
If a fielder fails to take the field with his side at the start of the match or at any later time, or leaves the field during a session of play
(a) the umpire shall be informed of the reason for his absence.
(b)he shall not thereafter come on to the field during a session of play without the consent of the umpire. See 6 below. The umpire shall give such consent as soon as is practicable.
(c) if he is absent for 15 minutes or longer, he shall not be permitted to bowl thereafter, subject to (i), (ii) or (iii) below, until he has been on the field for at least that length of playing time for which he was absent.
(i) Absence or penalty for time absent shall not be carried over into a new day’s play.
(ii) If, in the case of a follow-on or forfeiture, a side fields for two consecutive innings, this restriction shall, subject to (i) above, continue as necessary into the second innings but shall not otherwise be carried over into a new innings.
(iii) The time lost for an unscheduled break in play shall be counted as time on the field for any fielder who comes on to the field at the resumption of play. See Law 15.1 (An interval).
8. Transgression of the Laws by a batsman who has a runner
(a) A batsman’s runner is subject to the Laws. He will be regarded as a batsman except where there are specific provisions for his role as a runner. See 7 above and Law 29.2 (Which is a batsman’s ground).
(b) A batsman with a runner will suffer the penalty for any infringement of the Laws by his runner as though he had been himself responsible for the infringement. In particular he will be out if his runner is out under any of Law 33 (Handled the ball), Law 37 (Obstructing the field) or Law 38 (Run out).
(c) When a batsman with a runner is striker he remains himself subject to the Laws and will be liable to the penalties that any infringement of them demands. Additionally, if he is out of his ground when the wicket is put down at the wicket-keeper’s end, he will be out in the circumstances of Law 38 (Run out) or Law 39 (Stumped) irrespective of the position of the non-striker or of the runner. If he is thus dismissed, runs completed by the runner and the other batsman before the dismissal shall not be scored. However, the penalty for a No ball or a Wide shall stand, together with any penalties to either side that may be awarded when the ball is dead. See Law 42.17 (Penalty runs).
(d) When a batsman with a runner is not the striker
(i) he remains subject to Law 33 (Handled the ball) and Law 37 (Obstructing the field) but is otherwise out of the game. (ii) he shall stand where directed by the striker’s end umpire so as not to interfere with play.
(iii) he will be liable, notwithstanding (i) above, to the penalty demanded by the Laws should he commit any act of unfair play