Fred, Peter was using his usual quick and agile mind to suggest a whimsical solution to Andrew's problem. In the good old days(Middle Ages)the guy affixing the petard to the besieged castle, etc. would sometimes have it go off as he was doing so and the defenders would note with amusement as his body(or pieces thereof)flew through the air that he was "hoist by his own petard". Since Axiom wouldn't hoist Andrew up the tower, a petard might have been strong enough to do the trick.

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Enjoy the music, not the equipment.