I saw a program last week that focused on the engineering debate to launch/not launch. They said that two of the astronauts enabled their emergency oxygen right after the blast, but they suspect that all died quickly due to the rapid de-pressurization of the cabin.
I saw that program.
It does not jive with what likely happened to at least five of them who were locked into their pressure suits on lift off.
Scobee tried to fly that wingless comet. God Bless him.