49. If either of the players, in the act of striking, happen to move his own, the adversary's, or the red ball from the place it occupied on the table, the stroke is foul.
50. When the striker's, and either of the other balls are so close as to touch, and in playing the former off, the latter is moved from its place, the stroke is considered foul.
51. If the striker, in attempting a stroke, do not touch his ball, it is no stroke, and he must strike again.
52. If, when the balls are very near each other, the striker should make his ball touch the other, it is to be considered a stroke, though not intended as such.
53. If the striker play upon a ball which is still running, the stroke is foul.
54. Whoever stops a ball when running loses the lead, if his adversary do not like the ball he has to play at the next stroke.
55. Whoever retains his adversary's cue or mace, when in the act of striking, makes the stroke foul.
56. If the striker interrupt the course of his own ball, when running towards a hole, after having made a miss, and it is the opinion of the marker that it would have entered the pocket, had it not been interrupted, he loses three points.
57. And if the striker should interrupt, stop, or put his adversary's ball out of its course, when running towards or into a hole, he is subjected to the same forfeiture.
58. If the striker, after having made a hazard, or carambole, interrupt the course of his own ball, the stroke is foul; and he cannot score any of the points he may have thus made. ,
59. He who blows upon a ball when running