How high does this fictional rocket go before it jettisons this so called airliner sized tube to somehow regain fuel to burn to arrest a fall onto a silly barge just anchored somewhere in the ocean, as we are led to believe?
Do you serious expect anyone to bother taking much time with your request when you post that sort of trash?
But I have not seen a "crew Dragon" launch video with telemetry as yet but here is an earlier launch the gives speed and elevation.
Launch & Landing of 25th SpaceX Falcon 9 Rocket with Thaicom 8 by Space VideosOn that launch stage 1 engine cut-off was at about 3:06 in the video when:
SPEED = 8338 km/hr and ALTITUDE = 66.4 km and the re-entry burn would start a little after STAGE 2 STARTUP.
At 3:33 it is announced that "stage 1 has entered its 'flip' " and from 3:45 both stage 1 returning and stage 2 continuing into orbit.
Stage 1 finally lands at about 9:05.
But stage 1 does NOT "somehow regain fuel to burn to arrest a fall". Why would you ask such a question?
Stage 1 simply uses the fuel that was not burnt when its engines were cut-off at 3:06 as stated above.
Most liquid fuelled rocket engines can be throttled over a limited range and cut-off before all the fuel is burned - there is no magic involved!
You can believe what you like but that's what happened.