How do you beat casualties?

First, click the guy on the roof (left). Then the needle on the right. When the man who enters the elevator goes into the top room (2nd) floor, when he starts to talk and you can see the word bubble...

1. Click on the policeman's gun when he stops to look into the store. Click on the green button while the man in the yellow car is fueling up and he will get mad and hit it. watch for the clerk to...

well it depends what level your on..just find little things to click on so they can have an effect and kill people and if this didnt help u can go online or on youtube and look up the walk...