Because Sam challenged Armstrong before, Armstrong deprived him of his right arm, but because Armstrong had long taken a fancy to Sam's extraordinary talent and Sam was saved, Sam had to surrender to Armstrong. Until the emergence of lightning let Sam shine at the moment, although lightning has excellent fighting consciousness, but completely did not understand the nature of fencing. Sam grew up in the martial arts school and became more skilled in fencing. The first time he was hit hard by lightning, it was also because of the arrival of precious talent and the fire support of his lightning companions that he did not kill him. Later, he guided the progress of lightning step by step as an opponent, and finally personally tested the strength of lightning after growth. After being defeated by lightning, he entrusted his knife to the blade wolf LQ-84i, and when the time was right, he gave it to lightning. Of course, in the end, Lightning defeated Armstrong with this high-frequency village rain knife made by famous craftsmen, and Sam eradicated Armstrong with the help of lightning.
Sam didn't receive any body modification except an old-fashioned exoskeleton before, but later he just added a prosthetic leg. Lightning may be the earliest correction of mankind, perhaps second only to Frank Jaeger, the gray fox.