In his notes he says he couldn’t carry her back to the car and he wasn’t sure where the car was at that time.
That is not in notes. Why are you claiming that? It isn’t true.
What I do see is what he wrote on the page that begins with “They loved (me?) much...”
He wrote, “This occurred as an unexpected tragedy. Rushing back to our car trying to cross the streams of Spread creek before it got too dark to see, too cold. I hear a splash and a scream and I could barely see. I couldn’t find her for a moment, shouted her name, found her breathing heavily...”
“Her feet hurt, her wrist hurt but she was freezing, shaking violently, while carrying her she continually made sounds of pain, laying next to her she said little lapsing between violent shakes, gasping in pain, begging for an end to her pain,” he wrote.
He claimed he tried to carry her to their car but his knees buckled out of exhaustion and shock, so he started a fire to keep her warm. He then claimed that Petito wouldn’t let him leave her side to seek help”.
https://news.yahoo.com/brian-laundrie-notebook-confession-filled-204435564.html