Hank: How do wesen even know you’re a Grimm?
Nick: I don’t really know.
Hank: Maybe it’s time you’ve found out.

Yes, Nick, three years in you should probably know how wesen spot a Grimm. This is kind of important information.

There are some really interesting parallels here. 

Rosalee is a fuchsbau and Monroe is a blutbad, just like Jonvieve and Max. 

The big difference of course, being that Monroe has found a way to deal with his urges whereas Max has been forced into unleashing his.