coach/injury free throws

[MN 3 Sport Ref]

Sitch last night HS boys Varsity.

Player fouled on shot and goes down hard. Partner becons coach on floor to attend to player (he had been down for a few secs). Player ends up being fine and able to shoot free throws. I know rule is that if coach comes on to floor we need a sub. However coach wanted this player to shoot as "he created the opertunity I want him to finish it" This was towards the end of a tight game. We let him shoot the throws. (contrary to rule) No one said a word and this team ended up on the short end by two. I know the correct rule but was wondering if others wouldhave let him shoot throws in this sitch...