its is down on even number minutes( 0:00, 2:00, 4:00 ect) and up on the odds( 1:00, 3:00, 5:00 ect.). also, if any part of the unit that TOUCHES THE GROUND (a wheel on a warthog or support claw thing on a locked down cobra) it will fall if it is over the bridge when it goes.

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Scarabs are NOT a kill all alone force....