Without him knowing it, his primordial personality is taking over him that's why he was able to control the policemen a while ago. Blaine doesn't know how he acquired this mind control ability. He's certain this isn't natural for werewolves. He had just woken up one day, discovering in himself that he can actually do such stuff. To his excitement, he even tried to hypnotize Andrea, just to toy with her, but he was disappointed when he learned that his hypnotism does not work on her.
Maybe because she's a shaman wolf. He assumed.
But from then on, he didn't care how he got that ability, for his peace of mind he just settle in himself that maybe he acquired such because he had undergone a series of experiments before with Magnus.
Maybe a faulty experiment results. He concluded.
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