[Mondo is silent at first, unable to come up with anything to say. Yes, it is horrible that Ishimaru was willing to sacrifice everyone else for his sake, but he can't really say he's mad at Ishimaru for it. Ishimaru was trying to save him.]

...I don't hate you, kyoudai. How could I ever hate you?

[He reaches out to pull Ishimaru into a hug then, immediately trying to console his friend.]

I'm not gonna lie and say it's okay, 'cause it ain't, but I'm not mad at you. You were trying to save me after all! How could I be mad at you?

[He wants to say that he doesn't deserve it, that Ishimaru never should have tried to defend him, but he knows Ishimaru doesn't want to hear that, so he'll keep quiet.]

I'm sorry. I'm so fucking sorry you had to go through that.