Btw, i'm gonna run with that some sort of magical energy will enforce the rules of the binding.
So even if the knight does not know anything of the binding, it can explain the rules. This cannot be used to gain other knowledge.

Also, if the knight tries to harm a human, an unseen force will halt its hand.
Although there is some leeway in this. Like with Dredge's wrist, that didn't count enough to count as harm since his vampiric body could easily handle the damage.

[@Americore] congratz. You are my master..... too bad you don't know it yet >:P