when low in health and the person rushes to you , throw the grenad at the nearest wall (somewhat lika bank n boom) it will cause them to die from no throwback time at all
Pretty Old tip....been using this since Uncharted 2 ...
Hell you can even glitch Drake in the monestary with this
"Whats it going to be? Loyalty to your country or loyalty to yourself? Your country or your old mentor, the mission or your beliefs? Your duty to your unit or your personal feelings? Look how much you've lost already! What kind of country deserves this much loyalty"-Gene