Seriously....it was still just one demon at this point which they did not bother to consult the book of shadows about, or try that explosive spell from a couple weeks ago, or you know the freaking Power of Three. Piper could only somewhat freeze him and a needle full of poison not designed for killing a demon unsurprisingly did not kill the demon and that was enough that they went full on instant nuclear with the freaking temporal alteration spell. I mean not only was it a total dick move to alter Niko's life without giving her any actual say in the matter, (Yeah yeah can't tell her anything...and yet neither the Elders or Harry gave a crap about that random douche at the college getting to remember about magic and the sisters in the premiere) but she's a freaking cop that has been living in the city for how many years now? Has she accomplished nothing in that time? Maybe the spell can not bring back the dead....because reasons, but can it make other people die? I mean has Niko never actually saved anyone's life before, or maybe put away some killers who might have hurt other people, has she not had a positive impact in helping anyone improve their life in town? Seriously...the potential unknown ramifications of this kind of thing no....just no to using it willy nilly like this and Harry and the Elders being cool with it. I mean lets even just look at the first couple episodes. Niko accidentally took the thermos with the truth potion in it, if she doesn't and Harry actually drinks it thus cooperating with Macy's questions is she as quick to trust the Ouija board demon over him. Also Mel found out about the dead nun and students from Niko at the Halloween party when she got a call...that's how she figured out the virgin connection with the Harbinger. If she isn't friends with a cop then she seemingly wouldn't have found out about it until possibly later so how does that encounter go down now if they don't know the Harbinger is actively killing, and don't know to use Macy's virgin blood as bait to lure it away from killing others at the party?
Can we also include that fact that the same dam shapeshifting demon is still something they are going to have to figure out a way to kill anyways. Plus now as freaking quick and easy as this spell apparently is, it's now going be a floating deus-ex machina for why the sisters don't use it everytime things actually threaten to turn to total crap. For that matter we've also already established that Harry has memory erasing powers, so if the issue was that Niko was going to not stop investigating the mother's death and putting herself in danger why not just erase her memory of what she knew about it not being an accident instead of erasing her whole dam life for the past two years... Also if Niko was never Tripp's partner, and yet he still investigated the mother case then would he not have shared his information with his new timeline partner thus putting him/her in danger instead? Do you get how this whole thing is just a total horrendous poorly thought up sh*t show by both the characters and the writers?
IMHO the choice to have Mel freeze Niko for the entirety of their goodbye to me also took away a good bit of what little emotion there might have been in the moment. Again it also seemed like a dick thing to again not let Niko express herself at all in the moment. Which to me just seems like a pretty strong indicator that she will be back and thus they were not giving her a reaction scene to anything magical at this point. (On a related note she took her partner not being dead waaaaay too well.)
Oh and did they explain why Harry's memory was not effected this time? He did not actually participate in the spell....so if it was strong enough for upper level demons to be effected, why was he immune to its effects?
Actually I would expect Mel to actually have a different job already, just because she missed the one interview she should have continued looking for an applying for jobs and with so much time passing surely she already found something. So if they just pretend she was never employed because of this I am gonna call BS. Likewise I really hope Mel now has a new girlfriend or ex-girlfriend she does not actually know about because if she wasn't dating Niko she was probably seeing someone else at some point...