Invoking The Duck Test

"When I see a bird that walks like a duck and swims like a duck and quacks like a duck, I call that bird a duck." - James Whitcomb Riley

from The New York Post "Daily Blotter" December 14, 2013 (http://nypost.com/2013/12/14/daily-blotter-21/ )

Manhattan

A man was assaulted in Greenwich Village for no apparent reason, cops said.
The 24-year-old victim was walking on West Fourth Street near Sixth Avenue Saturday at 12:40 a.m. when Jason Wren, 25, accosted him and sucker-punched him in the face, authorities said.
The victim was dazed and dropped to one knee.
The attacker and two pals who with him started laughing and walked away.
But the victim got up and bravely followed them to a nearby building as he dialed 911.
Cops busted Wren in the building.
The victim was released after treatment for an eye injury.
Wren, who is from New Jersey, was charged with assault. His friends were not charged.
Police said the attack was not a part of the recent series of “knockout game’’ assaults.

Well then, what is it????