If someone is unwell, they can’t just 'change their behavior'. Telling Sean to change is unlikely to help Sean to get well or seek assistance

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Walter: Sean, can I talk to you for a second?
Sean: Yeah. Sure. What's up?
Walter: How you doing, man?
Sean: You know, I'm doing all right.
Walter: That's good to hear because you've been dogging it in practice lately. If you're good, you need to show us.
Sean: Yeah, I'll play better tomorrow.
Walter: All right. Later.

Walter and Sean - Transcript