User blog comment:Zathronas/Analysis by an author: Volume 2 episode 1/@comment-10390252-20140725123925/@comment-24218038-20140725201619

I'm not so sure he was trying to kill Sun. Note that he did shoot Ruby and she just got pushed away by it. The only murder we can confirm as of this moment was done by Mercury and his gun boots. Despite having seen Torchwick several times in a position to do so he has gone out of his way to avoid it.