everyone has there range and setup. if the max is 20 yards, then I would set the dekes at 15 yards. that way if he comes in to the back , he will still be with in the 20 yard range.if he comes inbetween you and the dekes, that ok also.

he may not want to fight and only strut back and forth,if he does that and the dek. is at 20 yards then he will be out of you range.

JMHO.