Let's just say this:
At this moment, the big vilain (Zelax) have almost complet his project called Sunrisa. A cannon that would make every technologie in the world usuless, excepted where the cannon will fire. So Zelax organization would be the only on earth to have technologie. For stopping this, the main hero (Zelox) and his camarad are going to stop him before the cannon is finally complet.
The scene you see here is between the two character : Cobra and Erzo.
This two worked before for the organization of Zelox. (A orginazation for helping people of the earth.) At that time, the two we're like teacher and student and also friend. However, after a mission that lead to the disparation of Erzo. He come back month later with a new body and kill almost Cobra but decide to leaving him almost alive. He is then saved by Zelox soldier. But he is giving a robotic body for surviving his injure.
Flash forward, Cobra come at the lowest part of Zelax base, for see Erzo. At this moment, the dialogue you see happen and the two fight after that.
Also for a little of backstory : Cobra was before a soldier that was known for being a emotionless killer. Killing various people in the world and surviving always the mission he was gived.
Erzo him was the first R-Man ever created. (A R-Man is a robot that can feel emotion, like the Reploid in MMX for exemple.) by Zelox and Zelax. He was consireded at the time a failure. Because of that, he was leaved alone in a laboratory. Month later, he is take back by Zelox who finish the first important project he ever created. However, Erzo become mentaly unstable and during a mission. He kill several innocent human and even other R-Man that was with him. After being stopped, Zelox decide to hide his memory and to give his violent attitude to another R-Man, Alphiax. (Another Advanced R-Man.) Like this, Erzo forget all he was before and only remember to be a recent R-Man created that was very powerful but also confused. But as you known now, one day. He knowned the truth and decide to venge against his "creator" who tried to hide his crime. He then rejoin Zelax (the brother of Zelox.) for one day get his revenge on Zelox and safe the world as Zelax intended.
So yeah, does that answer you question?