13. If a ball pass completely through a bridge in the reverse direction, and rebound or roll back under the arch, it is in position.
14. If a bridge be oblique any player may adjust it, unless a ball be under the arch.
That is, it must first be decided whether the ball has run the bridge or is in position.
15. The stake may be tolled from any direction and by the slightest perceptible touch.
An audible sound will be evidence of the tolling; but when it is so near that the sound cannot be distinguished from that of the mallet, it must be seen to change its direction.
16. A ball roquets another when it comes in contact with it from a blow of the mallet; provided both balls are bridged at the time of contact, and the playing ball has not roqueted the other ball before during the same tour since making a step on the round.
Case.—A booby hits a booby and both pass through the first bridge; can it croquet? No. It is not a roquet unless they remain in contact after passing through the bridge. It must roquet again.
17. A ball already in contact with another ball does not roquet unless it move it perceptibly.
To do this it must, of course, play in a direction less than ninety degrees from a line joining the centres of the balls.
18. A ball can acquire the right to re-roquet—that is, to roquet the same ball again during the same tour—only by making a step on the round.