Fighting against Ultimate Weapon is one of the hardest fights Angus has ever experienced in his past life. At some point, it is harder than his last fight before dying. When Angus fights against Ultimate Weapon, he has access to his enormous chi.
Unlike Firuman, which is filled with many dangers, Earth is much safer and he rarely needs to use chi. Therefore, his chi reserve is massive. Yet, with this tremendous amount of chi, he is still almost dying from the fight.
During this fight, he noticed a few things about Ultimate Weapon's ability. One of them is targeting ability. Initially, Angus thought it had a function similar to target homing missiles.
After the deadly fight with the Ultimate Weapon in his past, he gathers information about this legendary weapon. During his research, Angus speculates that its target function is to hit any target according to the user's will rather than simply homing ability.
