Author's Side-Note: So this explains Jet's betrayal and Giro's Death, Also this explains why it happened.
Chapter 10: Giro's Story and Action!
John: Now that I told about the rebels, let me tell you about my group of hunters.
Dash: Okay
John: When the rebels began causing havoc around town and cities the king decided to create a militia group known as the Rebel Hunters. Me, Joey and Giro made the top rankings in recruiting. Jep decided to recruit the three of us as elites, but he wanted a team of five people so he had Joey and I look for recruits. Joey decided to recruit Ray, a friend of our from grade school and camp, who wanted to help out. I found Jet who was a skilled fighter living in the streets.
Dash: So, how long did you guys stay together for?
John: We stayed together for four years. But then Jep began to experience complications of HBD, as a result he had to pick his replacement.
Dash: What's HBD?
John: HBD stands for Heart-Beat Disorder, It's a disease in which your heart has difficulty beating properly, which makes it hard to pump blood in your body so that you can get oxygen to breathe
Dash: How do you get it?
John: It's a genetic disease, so you can get it at birth or you can contract it by bad heart health, but only if you have the genetic trait and avoided it at birth. Jep was close to finding a leader, it was both Jet or Giro he was considering. He saw that Jet was too reckless to be leader despite being a good fighter, so he selected Giro.
Dash: What happened from there?
John: At first, Jet seemed calm but little did we know that he was angry. How angry was he? Angry enough to join the rebels and create a plot to kill Giro behind our backs. We volunteered to investigate some strange activity going on at the Island of Exile. We went on our ships and went to investigate in a mountain nearby and we agreed to split up. Once we reached a certain altitude, Rebels began attacking us and we saw Jet laughing at us but he didn't see Giro put me, Joey and Ray in cave to escape. It was only hours later we heard that Giro gave his life to save ours. We decided to disband the elite group and become normal hunters instead while Ray went to pursue other dreams in life. Joey and Ray were killed a year ago leaving me the only former Elite Hunter to avenge Giro's death, but I can not do such a thing, they injured me beyond the point of action. It's starting to get late you should leave
Dash: Ok
(Meanwhile at the next town over it is night and Dash just came back)
Kanji: Dash, I sense something!
Dash: What is it?
Kanji: Someone kidnapped a child, Let's track them down!
Dash: Ok (unleashes Kanji)
Rebels 1,2 and 3: General Scrouge, We got the kid.
Scrouge: Good! Bring it to me.
Dash (In Kanji Form): This is as far you go!
Rebels: Let's take this brat down.
(After being defeated badly the three rebels went to the Master as a punishment for their failure)
Rebel 1: We're sorry Master
?: You Three failed Scrouge and more importantly me, again! Your punishment is gathering resources.
Rebels: Dang it, Master not again, please.
?: What I say goes, that is your punishment and you must serve it.
Question 1: So Jet is killing his former comrades just for revenge?
Answer 1: Yes, Jet wanted to be leader of his former unit badly, However Giro was given that role, so he killed him and most of his former comrades all out of greed.