Verb (used without object) : to retaliate for an injury.    From Dictionary.com. 

Kirk pointed out in an interview with CNN (watch the full report below) that the bully can pick his time, but then a ruckus can take place, and the retaliator is typically the one who gets in trouble.    From Wordnik.com.  [Ty Smalley Death Causes Father Kirk To Lead Fight Against Bullying (VIDEO)] Reference

When he started doing so, we soon found out this backfired, since the retaliator always gets punished, not the instigator.    From Wordnik.com.  [Little Boys Being "Feminized"? « Unambiguously Ambidextrous] Reference

"The retaliator is getting suspended in all these incidents.".    From Wordnik.com.  [NBA.com: News] Reference

It always in the end returns with redoubled force on the retaliator.    From Wordnik.com.  [27. LETTER TO THE PRESS, AUGUST 13, 1919(1)] Reference

I think right now, the agitator gets fined, the retaliator gets suspend in all these things.    From Wordnik.com.  [ESPNsoccernet]

Cleveland's retaliation, but you know how it goes with these things: The retaliator always looks worse.    From Wordnik.com.  [Breaking News: CBS News] Reference

This was the original lex talionis and was given to restrain the retaliator from exacting a revenge greater than the original wrong.    From Wordnik.com.  [Conservapedia - Recent changes [en]] Reference

Which makes Denby’s account sort of like the ref throwing the flag on the retaliator.    From Wordnik.com.  [The Volokh Conspiracy » Defining Snark:] Reference

One retaliator, known only as Jsommersby, commented: "'Always blame the USA, even if you're wrong,' says a lefty-proof anti.    From Wordnik.com.  [New York Press] Reference

He's a good retaliator. ".    From Wordnik.com.  [Capitol]