I think a few posters are taking JAR's "I asked a guy at camp" defense too literally.

The point is that JAR asked a guy what his common sense told him. His argument is an appeal to common sense. Common sense tells use a block/charge play is either a block or a charge (in varying degrees). If there is a close play the mechanics manual doesn't tell us to rule a double foul to cover all our bases, it tells us to make the call as best we can (by deferring, PCA, etc.). It does make common sense to gather and decide on one or the other, and that's the argument JAR was appealing to.