The things they carried

"The typical load was 25 rounds. But Ted Lavender, who was

scared, carried 34 rounds when he was shot and killed outside Than Khe,

and he went down under an exceptional burden, more than 20 pounds of

ammunition, plus the flak jacket and helmet and rations and water and

toilet paper and tranquilizers and all the rest, plus the UNWEIGHTED FEAR. "

In this dialogue what does the UNWEIGHTED FEAR mean????????

Do you think Cross could have prevented Lavenders death? Explain