If mastermax were ever to create a Ultimate Assassin 4 I would really like to be able to kill the guards. The only way you can kill them though is if you are behind them and touch them. You can't kill a guard if they are in "search mode". And maybe another power up could be making a hole in a wall but if the guards see the hole they go into search mode.
 "Ultimate Assassin 3"){kind=icon}