2 second, TWO SECOND difference in separation. TOO DAMN CLOSE, INSANELY CLOSE for a vehicle traveling at over 200 MPH, and second at over 150 MPH approaching an intersection.
The full report summary (above) is WELL WORTH READING.
I do object to one characterization though; the 'chopper ran into the airliner' - I view it quite the opposite - the airliner ran into the chopper. The airliner was traveling MUCH faster, and DESCENDED directly into the chopper. The airliner was the one 'changing position the fastest' so it is the one that 'ran into' the other.