Help with quotes

Hi guys. This is probably gonna sound stupid to a lot of people but I need coming up with quotes for my characters especially with my main male character Takashi Dragonway's. I'm currently trying to think of a quote that an anime character would say to an enemy after the latter has killed/seriously injured someone close such as an family member (younger sister or mother) or a romantic love interest right before the character transforms and goes on a rampage. I got the idea for the situation from the scene in highschool DxD where Shalba "kills" Asia in front of Issei and Ddraig tells Shalba that he must pay before Issei activates Juggernaut Drive.