If the Blackhawk’s pressure altimeters had been both reading correctly and they had maintained 200 ft they would of passed only 75 feet under the RJ.
That is “nuts”.
Even if they had maintained 100 feet over the river that would still be classified as a very near miss.
A terrible case of Swiss Cheese holes lining up for a multitude of reasons.
An error of 100’ ft from field elevation during preflight would be out of limits and snagged in my civilian experience. Shouldn’t military aircraft that operate at very low altitudes at night have even tighter restrictions?