“...THE QUESTION REMAINS:
WHY CHOOSE SNOW TARGET OVER A CITY TARGET..?”
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Probably because he was fearful that the pilot rapidly assisted by a number of large passengers and equipment would succeed in BREAKING THRU the locked door and overpowering him. The mountain may well have been “Plan B” (i.e., anywhere on the ground).
THis is what I thought...the banging on the door...act fast