10-4-5c:
A play shall not...delay the game by acts such as: The free thrower fails to be in the free-throw semicircle when the official is ready to administer the free throw unless the resumption-of play procedure is in effect following a time-out or intermission.
10.4.5 addresses your question directly:
The ruling official has reported the foul and has given directions to players along the lane. The official is ready to put the ball at free thrower A1’s disposal, but A1 is at the sideline talking to the coach. RULING: A technical foul for delay is charged to A1. No warning is authorized in this situation. (10-4-5c)
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