I think in these kind of situations, you just have to nod, pretend to write something down, then do your own research later.
A simple risk/benefit analysis of pulling the fire handle (or not) with a possibly severely damaged engine and accessories tends to lean towards doing it. If it isn’t shot to bits and some time later you really need it back, the procedure is completely reversible. On the other hand, if it is badly broken and still connected to hydraulics, fuel, pneumatics and electrics, there is a chance this may lead to further significant problems, like loss of hydraulic systems, smoke/fumes in the air con or even fire in the nacelle (or a combination of these). Which would you rather be dealing with while flying around on one engine?
Another point is that with increasing severity, there is also an increasing likelihood of high energy bits taking out some/all of the warning systems. A while ago one of our jets had an uncontained failure (on the ground, luckily) which punched holes in the aircraft and set it on fire but there weren’t any immediate warnings...