If the A* calculation for a shortcut (in Step 3) finds it's now impassable, or if its actual detailed cost is significantly different (e.g., 20%) from the pre-calculated shortcut value:
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"We saw the news that this rocket had crashed into Poland. It had flown almost directly over us, and we thought, 'oh, this is a great chance'", explained Prof Robin Wing at the Leibniz Institute of Atmospheric Physics in Germany.