A 5 man team is bowling in a very competitive men's league with a high prize fund. Bubba is just plain not bowling well that night and his team captain, Richard Head, is not happy about it. In the 4th frame of the 2nd game, Richard tells Bubba to put his equipment away. He calls on the 6th man on his team roster to shoe up and sub for Bubba for the rest of the game.

Is this a violation of USBC rules and which USBC rule addresses this matter?