It doesn't have to be specific. It could just be something like 'In the last few seconds I managed to jump through an open window' or 'Molly saved me'.
I don't see how that would be traumatic to a child.
Clem didn't need to know specifics. Based on Kenny's treatment of Clem, he still thought she was a child, and thought maybe how he got out was too much for her.
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It doesn't have to be specific. It could just be something like 'In the last few seconds I managed to jump through an open window' or 'Molly saved me'.
I don't see how that would be traumatic to a child.