I never understood how the leg could pass in front of Jimmy's arm, for starters.
Well thanks to the power of VLC. Lets break this thing down frame by frame and really take a look at it. Because this always has bothered me but after looking at it frame by frame, well lets just jump to it
First of all I agree with Wolfies take on it. Upon many rewatches I always came to conclusion that Jimmy was the first one that died. Its the only logical proceeding. I've always envisoned being that Eli crashes through the ceiling landing directly on Jimmy and breaking his neck in the process. Then proceeding to take care of the other two.
But the problem I always had was with Martins legs dangling in front of Jimmy's arm. It always looked dis proportioned to me. Untill I really took a good close look at it frame by frame on VLC.
So as I said I agree with Wolfies analysis. It makes sense that Martin would run for the hills considering this whole time he has been conflicted with everything he has done to Oskar. In the first frame you can see Jimmy holding Oskar down, the mistake I would always make though is thinking that it was Martin's entire leg that came through the water. Making me wonder how that would be proportionally possible. But as you can see in frame two, its really only Martin's feet that enters the frame. Going by Wolfies theory, Martin makes a bolt for it, Eli flies after him and grabs him. He struggles to get out of her grasp but as we all that ain't happening, she takes him high up and brings him down just barely touching the surface of the water. As he is struggling to free himself, his feet enter the water and thus entering frame. Of course he is struggling and given the theoretical speed of Eli gliding along with him it would make sense that his body would be contorting in desperate need to escape. Now in the frame prior to all of this it is clear that Jimmy is reaching his arm out to hold Oskar under water. There would theoritcally be enough of a gap in his reach for Martin's feet to dangle just underneath them.
So the scene does work, when you break it down frame by frame and put some thought into it, Wolfies idea does theoretically work rather well.
However I can't forgive the fact that if Eli did break Jimmy's neck then why didn't his body go limb in the process. That's the part that I consider the real goof here in this scene