[Block/Charge is one of the toughest calls we make]
Many officials believe a collision between two players should be either a block or a charge. We are trained to delay our rulings when we hear a partners whistle to confirm what we saw so that we agree. Sometimes that delay does not occur (click here for recent example in an NCAA game).
When it does occur, there is a prescribed solution: both fouls are called, and any penalties awarded.