I should noted that 2 seconds was too much. One would have to have removed the nose of the plane in the video , which probably (due to friction) would have limited the ‘time’ it could ‘climb’ (continue on the same path due to momentum) to about 1 second or less.
At the aircraft's documented rate of climb, how many feet could it climb in 2 seconds?
There is your 'definitive answer' for how much it could have possibly climbed continued on an upward path due to momentum.