That's what I see as well, but what I wasn't sure about was if the engines were started there and the plane taxied to the cats, or if they were dragged there by one of those little trucks, then started closer to the flight line.

Either way, I just can't see a blast from the engine producing enough heat for a long enough duration to "cook off" a rocket motor.

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A Nerd can figure out how long it will take the original Enterprise traveling at warp 6.5 to travel from Regulus to Antares.
A Geek will think he can use that to pick up a girl in a bar.
A Dork knows he can't pick up the girl with it, but will hang around for hours anyway, just in case she asks.
She might. You never know.