Okay, my (kind of) quick thoughts/hopes for a potential conclusion to the cliffhanger and set-up for S3 events.
I have no desire to see this turn into a long, drawn-out beast of an abduction/torture plot that keeps Nick separated from his home and family. s2 had quite enough unrelieved misery for me, thanks.
So I'm thinking that Renard, who is still tailing Eric, sees a coffin and realizes he needs to keep his brother in Portland, even if he doesn't know who's inside. He can put those bitchin' cell phone skills of his to good use and pull some strings with air traffic control or something. He's got his fingers in every other cookie jar in town; no reason he shouldn't have an in there, too.
Meanwhile, Hank shows up and somehow helps M, J, and R with their car troubles. (If you need to shoot a few, do it. Hank likes to shoot things, and there are extenuating circumstances here. It'll be fine.)
Renard calls Nick, who is in currently away from his phone and in a box, so then Renard calls Hank. (See? I'm gonna make the cell phone thing work for us.) Renard's information is put into the deduction blender with the fact that Nick is missing and freaking out all his friends, and oh, yeah, Monroe has a WOLF'S SENSE OF SMELL (details) and this open storage container over here with creepy ritualistic crap and a big empty crate inside smells like his AWOL bff. Yay, deduction blender!
Cut to the airfield, where Eric has been stalled. Fun violence happens. Monroe faces off with Samedi, 'cause he wants to let him know that he thinks the whole poison/paralyze/enslave thing is a neat party trick, but it's also cool when you kill things and they stay dead, which, if you pull their tongues out through the bottom of their throats, they do. Like this, see? Cool, right? and you shouldn't spit at people; it's rude.
Renard has decided that he's going to let Eric go, because of politics and shit. This was about beating him at a game and denying him advancement, not justice or friends or any of that other crap that Renard doesn't, when it's all said and done, subscribe to. But oops, Juliette disagrees, and look, she found a gun! She proceeds to demonstrate that she has had enough of this shit, but is persuaded to buy that it would be more problem than solution to kill Eric. She concedes. Grudgingly. Then she puts one through Eric's kneecap, because nobody said anything about painful maiming. (details.)
The good guys take Nick home. The inevitable horrible waking up rabid thing happens, and is cured. The good guys get a quiet, happy, relieved reunion fade-out. (GRIMM WRITERS. I reiterate: the good guys get a quiet, happy, relieved reunion fade-out. are we clear on this point?)
Meanwhile, an ep or so later, in CGI Vienna, Eric is home and pissy, and now has a limp along with bad hair. Growling, bitching, damn-my-brother, gonna-get-that-ginger-bitch, blah blah blah. (Here's my favorite part.) A random toady enters the chambers of the king and queen of whatever the hell they're king and queen of, not real clear on that, and finds them beheaded in their own blood-soaked bed. Cut to Eric's wing, where he's planning his next nefarious deed. He's ranting and raving on the phone ('cause this family and their phonecalls), and behind him, the curtains stir. The pitter-patter of servants' feet comes running down the hall outside, there's a hue and cry being raised, Eric's annoyed, the curtains slip aside, and right about the time he hears something about his parents, up steps one Kelly Burkhardt, death incarnate and unhappy mother, to tell him what all the fuss is about.
Aaaaaand scene.