User blog comment:ImperiexSeed/The oldest being, archangel or leviathan?/@comment-5120709-20120529162257/@comment-184.77.255.73-20120601023915

It might've been a side effect of using the weapon, true, but I doubt it because Dick was smirking in utmost derision as he died. Which leads me to conclude that he's the reason they're stuck in Purgatory.

As for side effects, who even cares?

Gabriel's death didn't cause much of a side effect even though he's a high-level reality warper. Raphael is more powerful still and his death didn't do much, natch. However, a side effect of Raphael simply manifesting on Earth for the first time darkened the entire Eastern Seaboard; which makes even Azazel look like a joke.

And no, Cas goading Michael into taking the Molotov cocktail doesn't mean a Winchester can tag him with an Archangel blade. Even Raphael couldn't dream of landing a hit on Lucifer, much less Michael. =/