With regards to the sword thing. I think this is an actual example of the way the producers can edit the show to make it look a certain way.
I know there has been a lot of talk about how much influence the producers have over what is said/done. And I don't think they do directly influence what happens, but obviously it's a tv show so they are going to want to show what does happen in the most dramatic/entertaining way possible.
So I reckon they do something like, all draw swords. Harry gets the unbroken sword, they then film it again, this time with Harry stood on the final spot (if that's not where he was originally stood). They'll already have the footage of people drawing the swords the first time, and we know that they do pick up shots etc Who knows maybe they film it