Belgrod realized that the more Kael was left alone, the more things would go out of control.
He had to die, he couldn't be left alive.
And they had to chase after Chloe. If she activated the command system and locked it from the inside, that would be the end.
One could imagine the kind of power she would be able to wield if she successfully got control of the Arkship.
All this time, Belgrod had hoped to find a lion that knew the foundational rules that governed this machine. But none of the lions he had met could have been able to do anything worthwhile.
Putting an uneducated lion in the arkship was more likely to be disastrous to both parties.
The tigers have had to protect this metal structure from lions for fear of what could happen if the royals reclaimed their ark.
They were not willing to give the Lions an advantage again.