Megan, the stories of the Bravos nosing over came up during and after the court of enquiry in 1981, with the Vietnam pilots talking of things that happened in the 60s. Actual experience, not urban myth or "beer talking".
For the freefall, there is no allowance for the time taken for the brain to function. Yes, the time taken for the whole episode might be 11 seconds, if he was ready to go, the door was open, and all things working for him.
However, the first few seconds of the massive yaw and nose-down pitch were of the "WTF is going on???" variety, then the sound and impact of flying glass through the cockpit as the blade cut through the front window, then the left-seat test pilot, then the left side of the aircraft, and the tail boom, and the nose-down spiralling plummet towards the ground. Windspeed through the front window increasing with glass, blood and guts, and the total shock of what is beside him.
He did have the presence of mind to then try to escape, but undoing his seatbelt in zero g just made him float up out of his seat. Maybe had 4 or 5 seconds to try to get out, and even if he escaped he would have been too low for the parachute to save him.