User blog comment:Grimmival/Is Hank a Grimm?/@comment-76.106.14.39-20120510023951

Perhaps having sex with Adelaide under a spell that was broken left Hank with some "latent" ability that is coming out now? After all, if the blood of a Grimm can turn a Hexenbeist into a normal human being, what is to say that something cannot make a normal human being start detecting Wesen?

Also, remember Monroe's quote when Nick discussed telling his fiance his powers. It was along the lines of "most humans can't handle it because they don't want to believe it". What if Hank started believing it?

Just some things to ponder...