It stuck me as well. My uninformed guess is that it took both pilots roughly the same amount of time to run through their OODA (Observe, Orient, Decide, Act) l

It stuck me as well. My uninformed guess is that it took both pilots roughly the same amount of time to run through their OODA (Observe, Orient, Decide, Act) loop and conclude their plane was not recoverable and eject. And for both crew members of the same plane ejecting at the same time, I think the ejection of the second personnel is automated should the first one eject. (Not familiar with the F-18 fighter at all but I know it's like that in other fighters with two crew members).