If you want to smash Smith you need to select the level were you need to run from Smith. in 1 of the parts you need to kill some guy's standing by a SWAT van, from there, climb up to the ladder, instead of going richt go to your left and pick up the grenade launcher, than turn araund and run to the end of the. when you are on the half of the platform you see smith jump on the platform, then select your grenade launcher and activate focus mode. then shoot three times at Smith, when you've done that you'll see he's wasted, you can take his gun and run. you can do this with all the smith's you meet nut meek sure you must fire 3 grenades before he's wasted. Note: You must make sure you'll keep distance between you and smith or you'll blow yourselve up.