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Actually, with the people (and Summer) you mentioned that DID die, there were pretty strong and sound indications leading up to the deaths, that kind of didn't leave, at least me, hanging and wondering. I can't say the same about Syrio. I'm just rewatching the show and saw the fight with Meryn Trant and Syrio. Syrio didn't seem to have any problems with knocking the other guys cold out, and he did have a wooden sword, mind you. Everything about him just didn't say anything about him being afraid or overwhelmed by the situation - and for his life. As Arya leaves the room, sword clinging and screaming can be heard from the room she just left with Syrio and Meryn, this is also a total cliffhanger, because there's no way you could conclude who died in that moment. My guess is Meryn died, Syrio escaped afterwards. I've honestly come to realize that every single little shot and scene and line and sound in the show is a clear indicition of something greater, everything just seems to make more sense once you've pondered it for years. Not wishful thinking though, just something that feels right and logical, like deciphering the crazy minds of the writers and whatnot. That's just my take on the whole Syrio thing. He's one of my favorites alongside Khal Drogo. Truely hope we see more of them, though I doubt it.