The difference in attitude is alarming... From 25 degrees up to 75 degrees down is a pitch change of 100 degrees.. This would not have happened in the blink of an eye.
There is a lesser known equation that trades height for speed, and it is..
9 ft / kt / 100 kts.
ie at 100kts if you wish to gain or loose 10 knots you will need to trade 90ft.
So in this case if the pilot wished to increase speed by 25 knots he would have needed to just loose 280ft. From 2200ft this would easily be done by 1900ft... So why did he descend further? (And this totally ignores any positive effect that the engine thrust makes.)