Eight Trigrams Flash Fist Crush

The user launches a compressed shell of chakra at their target. It enters their chest cavity and the force crushes their heart, killing a normal person. The chakra blast is nearly invisible to the naked eye, detectable only by the disturbance it causes as it moves through the air. Of course if one possesses a Doujutsu able to see chakra this is not a problem. The technique is basically a Eight Trigrams Vacuum Palm, the only difference being an increased range due to the higher compression and an increased lethality due to the specific aim.