1. Shout: Stop! 2. Quickly make sure no civilians are in line of fire. 3. Fire before perpetrator can put hands in air. 4. If perpetrator manages to put hands in air, shoot, then plant soda can in still-twitching hand, preferably colored dull green, so it looks like grenade. 5. Put dead perpetrator in pig skin shroud and tell home village to come pick up and bury. 6. Have lowly clerk on hand with papers for parents of dead perpetrator to sign, and smoke cigarette, not being careful about where he blows smoke. He can then simply make motion towards corpse and say "nu?" indicating they should take it and get the hell out already, act irritated and impatient at any crying and carrying on.
No more prisoners for future swaps. No more Mr. Nice Jooos!