Sooo I tried to find anything about this because it seemed like kind of a theme to me, but I didn't really see much, so if somebody already brought this up someone can just lock this thread and downvote me a bunch also, there will be some spoilerness for AoL and White Sand, just so you know.
I've been noticing a pattern of people suddenly gaining lots of power right before they die. Two specific examples come to mind, Praxton from White Sand (at least it seems that way in the graphic novel, though not as much in the prose version), and Miles at the end of AoL when he's shot like a zillion times. There's also another example in the White Sand prose but I'll neglect that one because the prose version isn't canon and it isn't widely distributed. I think there might be some more examples of it, but I can't thing of them and it's been quite a while since I've read some of these books.
What really caught my attention, though, was something I caught when I was rereading Warbreaker. Unfortunately, I don't know how to do one of those fancy quote boxes, so I'll just summarize it (I can't remember where it is anyway)- it says something along the lines of "there are some people that when they are about to die their Breath gets really strong". That was when I realized that there was something going on, since before then I had just assumed it was just dramatic flair or something.
So that's kind of it, just that there's this pattern of random people getting a special burst of strength before they die. I don't really have any theories about why it happens, but if you do or if there are other examples of it that I missed post 'em here!