A game may be forfeited to the opposing team when a team—
(a) Fails to appear upon the field, or being upon the field, refuses to start play within five minutes after the umpire-in-chief has called “Play” at the appointed hour for beginning the game, unless such delayed appearance is, in the umpire-in-chief’s judgment, unavoidable;
(b) Employs tactics palpably designed to delay or shorten the game;
(c) Refuses to continue play during a game unless the game has been suspended or terminated by the umpire-in-chief;
(d) Fails to resume play, after a suspension, within one minute after the umpire-in-chief has called “Play;”
(e) After warning by the umpire, willfully and persistently violates any rules of the game;
(f) Fails to obey within a reasonable time the umpire’s order for removal of a player from the game;
(g) Fails to appear for the second game of a doubleheader within twenty minutes after the close of the first game unless the umpire-in-chief of the first game shall have extended the time of the intermission.
Notice the discretionary language in Rule 4.15, "A game may be forfeited. . ." Contrast this discretionary language with the mandatory language found in Rule 4.17, "A game shall be forfeited. . ."
Rule 4.15(c): Manager pulls players citing safety concerns. Game was forfeited.
Rule 4.15(a): Team fails to appear at game time.