Arya's injuries

My only problem with any of these "not Arya" or "it was all planned" theories is that she looked legit shook after coming out of the water. None of them can explain that.

Oh, thank you I didn't remember it exactly. So Jaqen alone washing himself from the blood.

Also I think that junior FM is able to use face from Hall of Faces with better (Waif) or worse (Arya) effect depending on experience, but they have to choose someone similar in height, weight, sex to them, at least in show canon.

Well whether it was Arya or not, they still got stabbed three times in the stomach.

My problem with it is who would possibly help Arya in Bravos?
Syrio is (sorry guys) dead and Jaqen or whoever he truly is helping Arya makes no sense. Even if Arya doesn't have Needle, it doesn't mean it's not her... she could just as easily of stashed it somewhere. Remember, injuries in GoT aren't greatly consistent. Jon recovered from getting plastered with arrows at the end of S3 very fast in season 4, and getting stabbed in the leg by Karl Tanner had no consequence later on. They can have some randomer 'nurse' Arya back to health and I doubt many people would care.
They would need to really explain this well if they decided to do an 'Arya isn't Arya' twist, and I don't really know if it's been built to very well in the past few episodes.

If he was scanning faces to see ones he recognized - why did he not seem to recognize the old lady face? That's the one shown in the previous episode that Arya touched so we know it (I wouldn't have remembered it, great job reddit people!) and Jaqen would know it but he acted surprised. Was it just an act?

I do support the counter arguments that Jaqen taking a risk on the waif being the proper assassin and slitting his throat seems odd but if as they say, he's kept his name from the three Arya named originally, then he clearly hopes the waif is going to to do a quick job of it since it's himself that will suffer. That's why he tells her not to let the girl suffer. 

I dunno, guys. I think even "it was all a dream" is more likely than any of these theories

I suppose that makes sense. I guess we won't know till sunday.
Still, I don't think thats the same Jaqen from Harrenhall, so would that debt still apply?

I really want to keep something that would explain the Arya's nonsense behavior. In the last episode, Jon wanted to attack the Winterfell with less than 2,500 people, Sansa tried to win a contest for the most arrogant lady in Westeros, they both behaved like brainwashed, and all to give the writers an explanation on the necessity of the LF aid. When also Arya done the dumbest thing in the world, I already had enough. Oh please, don't judge me I only want to the behavior of the characters fit what we know about them

And Arya didn't behave like Arya. From the first second when I saw how she moves wondered why she was acting and why ceased to hide, surely she knew what awaited her. When I heard what and how he talked and I wondered why she pretended so confident. When she gave to surprise on the bridge, I could not believe how could she even temporarily lose vigilance. This wasn't smart, cautious, rational girl, I know. Explanation: or within one episode forgot everything she learned and lost the instinct of self-preservation, or we have a twist and that everything was a game. After the unceremoniously and foolishly her siblings has been treated by the writers, I preferred to stick to the second options. And yeah, I know that probably the explanation is simpler and writers don't give a shit about logic and character development when they need a specific things to happen.

well, i am just going on my feelings here, the scene was meant to appear odd. Thats why we picked it up. So there has to be something more to it. Why did she walk through the crowds whilst injured? why didn't she lay low?

No one in Braavos would help her (except lady crane, but maybe not even her unless she is westerosi) because everyone knows what the FM are, its the best known secret

'Arya' acting suprised after getting stabbed...doesn't really mean anything to me. If it was jaquen then he would be trying his best to be arya and thats what she might do in that situation. The show is pretty good with the little hints and i think if it turns out that this was a test for the waif, then it would actually make sense looking back.

Yeah, but the baths has been used before in Season 4 when Davos met with Salladhor Saan.

Exterior shots were used for all three cities, but I'm fairly sure that this scene is happening in Braavos.