[As Saki explains, it takes some time for this memory to actually hit him. He has plenty of brothers, after all, so that doesn't narrow it down.
When she describes a bad lie, though, Castiel remembers it. He remembers Balthazar's face, flickering with doubt and uncertainty. This is a memory he would rather not have shared with anyone, especially not a stranger.
He shakes his head almost violently as she finishes.]
You should blame me. What I did was wrong.
[Castiel had felt abandoned at that moment, believing that all of those closest to him had turned on him -- but they'd had good reason. He'd been completely unreasonable then, driven by desperation and the need to do the right thing in what felt like impossible circumstances.]
Action
When she describes a bad lie, though, Castiel remembers it. He remembers Balthazar's face, flickering with doubt and uncertainty. This is a memory he would rather not have shared with anyone, especially not a stranger.
He shakes his head almost violently as she finishes.]
You should blame me. What I did was wrong.
[Castiel had felt abandoned at that moment, believing that all of those closest to him had turned on him -- but they'd had good reason. He'd been completely unreasonable then, driven by desperation and the need to do the right thing in what felt like impossible circumstances.]