Given the task definition and input, reply with output. Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.

Sentence: 'Cain in killing Abel , stabbed half the world at one blow , yet he could not kill the worm in his own conscience !', Argument/Subject 1: 'cain', Argument/Subject 2: 'abel'
kill