I tried passing that with a baseball bat & Knife-- Melee weapons... before reading actually how to do it...
What are the controls for countering?? I don't recall--(I normally counter with bullets).... doesn't seem to show it in the pause menu??
I read a good place for doing this is the heli tours landing area-- if you get low on health, you can get food at the vendor out front.
//Edit// Nevermind, I figured it out-- one thing I found though-- I was doing this at the heli tours area and got killed, I respawned at the hospital, immediately got in a taxi and went back and resumed... and got the trophy immediately after resuming (first counter)-- so evidently dying does not reset the 4 minute clock.