meaning of killing dreams

had a dream i was killing a man that wouldnt die. i would stabed him sevral times and sliced his thorat the man just laughed.. there was blood everywere the man just kept tryn to get up i locked my self in the bathroom with my two brothers and asked them to help me kill him but they didnt we then escaped from the bathroom window.. the rest i dont really rember it was very scary what does this dream means !!