1. A. Jasnah, I assume, went into Shadesmar, thus escaping from drowning, which is pretty reasonable since, when dealing with Shadesmar, sea is land and land is sea, etc.
B. The thing with Szeth was--I admit--a little clumsy (Sorry, Brandon!!!), but you can't kill off the assassin in the *soup*ing second book of a five-book series! (don't ask about the "soup" thing, please)
C. It's an Honorblade, which is obviously not the same thing as a Shardblade since (as far as I know) Shardblades don't make you able to fool around with gravity, etc.
2. People have been talking about Nightblood showing up, so I'm going to digress for a bit.
So, I think that this comes after Warbreaker. Zahel (the swordsmaster guy) is Vasher and I'm not exactly sure how Nin got Nightblood but I assume we're going to hear more on that subject. We'd better hear more on that subject.
You probably already know most of that, so sorry for wasting your time, but I just wanted to make sure.