He saw the line of small scars that ran down Thorn's left breast, each one marking a death by his hand in battle.
He saw the large scars that ran across Thorn's right breast and up his shoulder. 
mnli hypothesis: He saw the large scars that ran across Thorn's right breast and up his shoulder.  premise: He saw the line of small scars that ran down Thorn's left breast, each one marking a death by his hand in battle.