She was trying to protect us! [Somewhere far away from his current feelings he'll look back and think how he should have known better. Should have not let the conversation move onto such a sore topic.

That is when Vash can look back with hindsight. Right now his emotions are too raw. The life he had been trying to build for himself here is being pulled out from under him. He's been teased with both horrid and hopeful information of the future. After all that this felt not like picking at a scar that could never fully heal. This felt like it was being ripped open.]

She thought she was protecting our happiness by not telling us! They made a mistake! She was trying to do better! It's not like you don't make mistakes! They're not perfect and we're not perfect! No one is! I'm not the one who's fooling myself, Knives. You are.

[Vash should also know better by now not to talk back to a dominant in public in this city. His angry outburst is starting to attract attention now.]