I thought he might have drank demon blood as well. But the Armored Giant case makes you think it's really difficult to control the demonic power when mixed with strong people (it's why they resorted to only giving to apprentices).
Or he probably drank demon blood, and I guess he didn't lose himself, and the eyes are a side-effect of the perfected state.
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Re: Is Hendricksen even human?
I don't particularly think he's drank demon blood or hsi eyes are an indication of anything as such. But I wouldn't dismiss the fact that he could well have dabbled with other experiments, seeing as he's the current occupier of Merlin's magical research lab.