I suddenly realise upon a re-read that Isaac is repeating exactly what the reflection calls him: "my dude", "my bud", "my man". Maybe failing to do that is the slip-up the reflection is talking about?
Billie
2022-07-14 10:38:52 +0000 UTC
I wonder if them slipping up just happens every so often, and the two of them trade places every few months?