He leaves. He left his guitar without realizing in his rush to leave.
"Kaz!.."
Kaz is gone. Don picks up the guitar. He tunes it and starts strumming
"I saw you dancing in a crowded room. You looks so happy when I'm not with you. But then you saw me caught you by surprise. A single teardrop falling from your eyes. I don't know why. I run away. I make you cry. When. I run away. You could've asked me why I broke your heart. You could've told me that you fell apart. But you walked past me like I wasn't there. Pretended like you didn't care. I don't know why. I run away. I make you cry when I run away. Take me back cause I wanna stay. Save your tears for another. Save your tears for another day. Save your tears for another day. I made you think that I was gonna stay. I said some things that I should never say. I broke your heart like someone did to mine. Now you won't love me for a second time."
Kaz tunes his guitar and sits on the stage, deflating a little. Don can hear him as he walks away
Kaz: ...Everybody gets high sometime. You know What else can we do when. We're feeling low. So take a deep breath. And let it go You shouldn't be. Drowning on your own. And if you feel you're sinking I will jump right over Into cold, cold Water for you...And although time may take us. Into different places. I will still be Patient with you...