Nappa decided to test the power levels of the living beings with his scouter(it does not work on machines). He noticed several high power levels from those who appeared to be armed with melee combat weapons or fists. He noticed the ones armed with firearms had decent power levels for their appearance. He decided that the one calling himself "Caboose" and rambling on about bedtime stories would be his first target, due to him sounding very childish. He mumbled to himself "Huh, Not the power levels I was expecting, but I still should be able to take 'em. I am a saiyan after all....."