we know that perhaps this is an unlikely, but there may be a possibility if we consider it in this way.
1-Takuma, was a friend of Kaname for almost a decade, as Takuma said in chapter 55. "during the ten years i Spent w / kaname ..."
So I think that being friends with a pure blood for so long, had to have given him advantages of their weaknesses and powers ... ect ...
2-Kaname, never had confided their secrets, (as the existence of Yuki) to someone who is left weak and manipulate. So this gives us that maybe we understand the Takuma is stronger than we thought.
3-Kaname, he was never worried that Takuma (The person who knows all his secrets), was with sara, which someone might consider a threat. Kaname always knew where Takuma was.
4-Rima said in Chapter 76. Takuma perhaps this with Sara, to know their plans, to help someone. "didn´t he say he was going to keep an eye on sara-sama so he could be of help to a certain someone..." And this may be true. Recall that Rima is always right, LOL ..
Well here are some things that came into my head while thinking about the poor Takuma ... Perhaps this betrays sarah? I know he is under the effect of the blood of Sara, but requests are only physical, not mental. And maybe kaname told him that there was a way to avoid being controlled by a pure blood or something. Remember that the only ones who know the true powers of the pures bloods are the same pures bloods.