Why revere St. George tho' of dragon blood?

Why revere St. George tho' of Dragon blood? 

My head was severed chewing cud

Is, oddly, what Vrtra, by Vishnu led,

To graze my Trivikrama pasture, said.

Envoi- 

Prince! Who is Tvashtar, what Danu?

Death thy skill, it kills you too.