Multiple Personality

'Why did Gilbert manage to regain his senses? No, it would be more appropriate if I asked about why the connection I had with Gilbert got cut off.'

Was it due to the insufficient Death Mana that Gilbert managed to regain his consciousness? In that case, wouldn't every Mind's Puppet that I would later control be suddenly disconnected, and they would regain their consciousness? 

To be clear, I started sifting through what I knew about Mind's Puppet. 

First, Mind's Puppet can exist because Death Mana has accumulated in the Stigma of Darkness. Meanwhile, I can collect Death Mana through the people I kill. 

The more Death Mana in the Stigma of Darkness, the longer the duration of Mind's Puppet control. Considering the way Death Mana is collected is by killing people, wouldn't I be a mass murderer? 

And the second and most important thing is another trigger for Mind's Puppet to activate. That is the target must have demonic mana.