Gheebat is both the father as well as the son of animosity. Sometimes gheebat is the result of animosity, and sometimes animosity is the result of gheebat. This is indeed an abominable lineage.
We have all seen that when one person is bent on harming another, he becomes oblivious to Deen. He does not abstain from harming the other person or from lies and deception. His objective is only to cause harm to his enemy, regardless of the destruction he causes to himself.