...or they might take an engine off a rocket they have in the garage and use it instead.
You gotta admit that's pretty cool, eh?
"You see, the problem here is this faulty thingamijigger-whosamawhatsit on engine 5."
"Really? Well, that's too bad..."
"Sure is, but you're in luck, we've got a spare rocket engine just sitting over in the hangar there. We'll swap the parts and you'll be on your merry way to orbit in a couple days!"
"Oh! How fortuitous!"
I mean, how many launch companies can realistically have a dialogue like that?
Don't think you can turn off the engines once they are lit up, most rockets are based on one long controlled explosion coming out of the back.
The article I saw said it was aborted at T minus 0 5 seconds, which is cutting it closer to the explosion than most action movies does
Well, actually the explosions (9 of them, 18 technically if you count the gas generators) happened. Rewatch the videos, you can see the engines light, very brightly if I do say so. They were just cut off when a commanded abort closed some valves somewhere along the fuel/ox supply lines.
As for being able to shut rocket engines off, well that's simply a matter of what kind of fuel you're burning and how much control you have over your valves if the fuels are liquid or gaseous.
Argue that all you want, but the fact is that politicians don't get paid all that much, yet Senators all live very well, well beyond what a $175k/yr salary would suggest.
When the fuck did $175,000 / year get classified as not "all that much." Both of my parents combined never made even close to that amount and we grew up fine and dandy.
Real programs don't eat cache.