It was a dark night at the Mystic Falls high school. Everyone was ready to take down Klaus. But then Katherine found out that if Damon tried to permanently kill Klaus or succeeded, then Klaus' hybrids would finish off Damon. So, she had a heart with heart with Stefan, telling him to "care enough to save Damon's life."597Please respect copyright.PENANA20jdrZ8nmF
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When it came to that point, Damon didn't succeed, because Stefan stopped him, saving both Klaus and Damon. And for that, Klaus released him from his compulsion. Stefan was free, humanity switch back on.597Please respect copyright.PENANABfsqhPoFdE