User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-50.53.164.184-20130511172425/@comment-3146930-20130511174534

I don't think so. While it is true that Mars doesn't like useless fighting and killing her himself would prove that death isn't working, the Underworld is not his domain and he would have no way of knowing who could and couldn't escape. Mars may have just been waiting for just the right moment and it came when she was killed. Or he would have come anyway as monsters were still reforming quickly.