[Zagreus' grip on his blade doesn't falter, but he does look over his shoulder to where Thanatos is seemingly frozen in place, and his bravado fizzles out. Maybe brute forcing his way through this won't work after all, so he chooses his next words with care.]

Than... you know why I had to leave. And I'm sorry I didn't do it right... That I didn't tell you. But I couldn't stay in the House forever and not know the truth. I couldn't live with myself that way.

[He lowers his sword, turning to Thanatos properly.]

I never wanted to leave you. Truthfully, I don't know what I'd do without you. I can't convince you with just words, I know... but I still want you to trust me.

[Tentatively, he rests a hand on Thanatos' arm, as if it might help bring him back from the haze of dark thoughts the illusion is trying to drag him under.]

Please.