If they believe that no defensive change has occurred, they may barrel their way into a mistake. After A Called Timeout. Many teams need a timeout to discuss any change they want to make on the floor. A coach should always make his offensive personnel aware of the possibility of a defensive change after a called timeout, and should lay out the defensive options his team might face. Off A Press.
Many coaches like to switch defenses from a pressing situation.
The offensive team may be so concerned with beating the pressure that they'll overlook the possibility of a half-court change in defense. This is a good time to make a defensive change, and the offense must be ready for that possibility. To Neutralize A Hot Shooter. When a player lights up the scoreboard shot after shot, changing defenses can become almost a mandate. Sometimes, putting a different defender on the hot hand does the trick, but sometimes a more drastic change is needed.