WHEN YOU GET NO SNSAKARA
The give-and-take of sanskaras depends on the attitude of the mind, i.e. if you do a certain action with good intentions, you catch good sanskaras, and if with bad intentions, bad sanskaras ... When you go on a hunt, you kill an animal for the sake of sport and enjoyment. You therefore take its bad sanskaras. But suppose you are going through a forest and a wild animal attacks you. In order to defend yourself, you kill it. In that case, you do not catch any sanskaras.
That is why, without attracting sanskaras, you may destroy the lives of bugs, mosquitoes, scorpions, et cetera, which cause injury to humanity. You may kill the serpent which comes to bite you; but you must not kill the serpent which you happen to see in a jungle while taking a walk