He said the bright colors would make the job easier, that the blue box contained a very powerful smoke bomb. Jesus reaching hand poster. In the red box is the explosive. When one of the hired killers finishes throwing the red box, the other has to press the button on the green box and they both escape thanks to the cover of smoke. In fact, the smoke bomb was purely a fabrication so that the Bulgarians thought they could escape. Both boxes contained bombs of equal power. There was no difference between a green box and a red box, with the intention of destroying both you and the bomber without leaving a trace.