Sera didn't refuse Hogg's kindness. Instead, she seriously studied Immortal Hogg's advanced lessons in rebellion.
As they grew more familiar, Sera realized the dog wasn't entirely useless. He was just a chronic slacker. He clearly had all this knowledge in his head, but never put it to use, always thinking about finding somewhere to nap.
But Hogg could hardly be blamed. His ideal was to eat, sleep, and wait for death, and his ambitions were that pathetic. Otherwise, when the Emperor discovered him, he would have already united the planet instead of setting up a stall in the Hive City to sell flatbread.
As an ultimate life-form of the Human Federation and one of the Golden Men, Sera was exceptionally clever. Otherwise, she never would have risen from a low-ranking soldier to a regional governor.
She wasn't some naïve fool with nothing but lofty ideals. Sera's true nature was decisive and efficient, which made Hogg's lessons go smoothly. She could even draw conclusions from a single example when it came to controlling Psionic Energy, adapting his teachings and improving on them.
Hogg credited this to his own teaching ability. After all, great teachers produced great students, and the more accomplished his student became, the better a teacher he must be.
Yet the more things went this way, the more conflicted Hogg felt. When he thought back, he realized he'd never heard of anyone named Sera, which meant her fate probably wouldn't be a happy one.
Like the Slann, Sera was stubborn. Hogg had urged her more than once to give up and find somewhere to hide, but no matter how he tried to persuade her, Sera wouldn't agree.
There was nothing Hogg could do about it. He could only pass on everything he knew, though this time he had to