It will be interesting, for many agencies, to hear what the proximity was in the incident. There will no doubt be new data to learn. From the times of takeoff I assume this was in darkness and the startle factor must have been severe; worse than the BA 747 all engine flame out in volcanic ash. At least in the daytime you might spot the other beast sitting ahead of you and think about the risk, but at night it would not be so obvious. Trying to catch the coffee cup sliding and elevating off the cockpit table could have been challenging. All those electronics and liquid are not cosy bedfellows.
The subsequent captain's PA would also have been interesting and a little challenging.