Par'hyponoian, from Greek ὑπόνοια hypónoia "logical assumption," is a logical or thought trope, consisting of the replacement of a second part in a phrase or a text that would have been logically expected from the first part.[1]
The pun is based on the unexpected modification of a well-known idiom.
"A polarizing figure" is something that would have been expected to be said about the president Hugo Chávez.
"Bloodthirsty beast" would have been expected to define a bear.