That the NG remained in place after those two impacts is both testimonial and message. The distance from the camera is deceptive, that is a very large a/c moving 1/3 its length in Nose up/down in what appears to be one second. I can't calculate the acceleration due to that bounce. To say the crew had their wind knocked out and their bell rung is to put it mildly. It is the equivalent I'd say of a free fall from at least a three story height, generally fatal unless cushioned, (they were seated). The 737 in Schipol experienced a similar nose impact, and the crew all died. I think after the initial bounce, they were incapacitated.