Wait for the first shot to be taken.
Subs go in either right before the last shot or immediately after the last shot (if it is good). Some sets of rules provide exceptions that if there is a required sub (injury, blood, DQ) all subs may enter, even if there are 2 or 3 shots left.
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"To win the game is great. To play the game is greater. But to love the game is the greatest of all."
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