Pyroclastic flows are fluidized masses of rock fragments and gases that move rapidly in response to gravity. Pyroclastic flows can form in several different ways. They can form when an eruption column collapses, or as the result of gravitational collapse
Pyroclastic Flows
And as Daws noted there was no pyroclastic flow and your "expert" was, like you, full of CTBS.
Thanks again for playin', Princess. You're dismissed.

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