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Anyone who would watch this scene might think that Raven trick this two and enslaved them, hereby removing their free will out of their body. In fact however, this is definitely not true at all.
"I don't need you to bow in obeisance nor salute me each time we meet. I took you in as my trusted confidants, all I want is your loyalty. That's enough."
The seal that appeared on Raven's hands are no slave seals but instead a Pact of Trust. It is a seal that plants a fair connection between people.
'You trust me, I trust you. So long as we are connected, I will shelter you. This bond shall never be broken by anyone else but you. So long as you don't sever this connection, then neither shall I!'