In reality, although his brother verbally refused the Emperor's assistance, deep down he still hoped the Emperor would send reinforcements to help him. But the Emperor had no interest in playing riddles with his son; a refusal meant no need, so he naturally wouldn't send any troops.
Thus, things turned out as they are now, with both sides believing they are not at fault. Angerong felt the Emperor had wronged him and his Gladiator comrades, while the Emperor thought, "You're the one who refused reinforcements."
"The Butcher's Nail has vanished from your body; you are now whole and free, no longer ruled by anger and fury," the Emperor said calmly. "You have your new brother, Laine Macado, to thank for this."
After reshaping his body, the Butcher's Nail naturally disappeared from Angerong.
"My new brother?" The World-Devourer Primarch was full of confusion. "Macado?"
The Emperor explained Laine's role to Angerong.
"Greetings, brother." Laine stepped forward voluntarily.
