User blog comment:Omega natsu2/Chapter 368: The Third Seal, Predictions./@comment-31.132.65.50-20140122012525/@comment-1359322-20140122140125

Destroy aside, Zero doesn't have a thing to killing though destroying and killing people is the same thing.

Well like Zero said in his initial appearance, he just wants to destroy, it doesn't matter if their injured, incapacitate, fainted or even an object. That's why he attacked Jura even when he was down after covering Natsu and his friends.