Is it me or perhaps it’s a simple coincidence but I find it serendipitous that the 13th episode of Grimm’s fourth season coincided with the ominious Friday the 13th. And while the hot new Wesen, pun intended, is blazing a path of destruction in Portland, the most exciting tidbits lie in the last few minutes of “Trial by Fire.” Old feuds resurface for more than one of our main characters, and truths are finally revealed.