Babatunde was not impressed with the attitude of Arinze, he became so arrogant but that could be because he has been in prison for the past 15 years so he was cut off from the world but he was aware of the Generals and what they represented seeing as it is Abdel that put him in this cell. He held a very strong grudge against him and trained in secret to get enough power to kill the man that made a fool out of him but he heard that a man named Mihir had taken his prey.
He could not believe it either, Abdel felt like a mountain that could not be moved no matter what you threw at him so this news came at an utter shock that someone could deal enough damage to actually kill him.
There was no way a contingency plan would not exist for such a scenario, and this could explain the ease of Babatunde as he knew that Arinze might be a criminal that they could not kill with any living Abnormalities present but they had ways to contain him.