I cannot work the link in PPRT's post to the NTSB report, but I am puzzled by
"Eight seconds later, the controller stated, "if you don't have that traffic in sight turn left heading 180 immediately." Over the next 18 seconds, the track of the F-16 began turning southerly."
18 seconds is a long time to be turning - did the collision happen in the turn? Do we know what was the time of the collision?
According to PPRT's post, the 'immediate' avoiding action was called 16 seconds after the "2 miles' call, which should have been enough, I feel.