study guide question written late at night?

[just another ref]

In setting a stationary screen, team A has four players get down on all fours as in a football stance. Official rules that this is not a legal position in setting a screen. The ruling is correct.


That's it. That is the whole question. I don't know what they are asking. No B player was clipped. No B player stepped on one of these "screening players" head. (as far as I can tell) The act of getting down on all fours, in and of itself, is not against any rule that I am aware of. Someone enlighten me please.