I have discovered, admittedly near the end of Manhattan, that u can easily kill the bots with cannons, and the bots with rpg's without losing ANY ego. With the cannon toters, u land near, then, then DUCK, and wait for it to come to u. When it's right next to u, wait for it to fire and then kick it, THEN duck FAST. Keep repeating this til it dies. NO loss of health. BTW, the bot doesn't do anything while it's nearly on top of u, so it's safe. The other bot with the RPG is another story. U leap and drop til u r just hanging there, on the edge of wherever the bot is. Then when it turns away, use the shotgun to fire with, leap straight up, and fire, and drop back to the edge. Repeat this til u kill it. NO EGO loss. Hope this makes it more fun to kill the bots.