Why was so much blood running out of Budd Dwyer's nose after he shot himself through the head?

I just watched the video of Budd Dwyer comitting suicide, but what I don't understand is why there's so much blood running like a waterfall out of his nose. Anyone got an explanation?

Anonymous2015-08-07T13:51:17Z

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Your brain is FULL of blood, and Budd blew a hole clean through his pallet into his skull, so his heart kept beating (and even sped up for a spell), pumping pints and pints of blood out through his nostrils and mouth....

https://www.youtube.com/watch?v=o9mJ82x_l-E

Anonymous2015-08-07T12:56:41Z

Period blood

Anonymous2015-08-07T12:57:50Z

Uh yeah, because he blew his brains out!

DUH!!!