Don't board? Right and then miss your slot, yeah that would go up like a lead baloon in Ryanland.
It was policy to board regardless even with a slot of up to 2 hours. Can't blame the CP, just doing what the've been told. If OPS are going to dispatch an aircraft with an APU U\S in the summer season with high temps and slots about then they should make sure there's an air cart, they wouldn't dispatch the aircraft with an APU U\S to destination without an airstarter so why not an aircart? Money. You could also argue why don't EIN have another aircart.....Money