A1 is unable to attempt either of the two free throws awarded because A1 was injured during the play. A6 enters, replaces A1 and attempts the first free throw. A7 reports and enters to replace A6.
A7 must return to the bench and A6 remains in the game to attempt the second free throw. Since A6 replaced A1, A6 must shoot both free throws, unless A6 is injured or disqualified before attempting the second free throw. If this situation involved technical foul free throws, A7 would be allowed to enter and attempt the second free throw.
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