> “I can’t imagine the forces he must have experienced being thrown out of the aircraft,” Sventek, who spent 31 years in the U.S. Air Force, said in an interview.

Some initial impulse from the ejecting motion of the craft breakup, and then immediately after losing contact, the only net force should be the one from air drag due to the velocity. There is gravity, of course, but in free-fall, that force is balanced by your acceleration so you don't feel it. As you reach terminal velocity, it rises toward 1g.

That air drag would be a big force, though, when you're thrown into the air at the craft's velocity.