I agree, and that is an interesting take but...I still think too many things were involved in the shooting, it reminded me to the scene that ended with Butters taking the Blade, when Harry was trying to do something but his aim was not too good.
I mean, if it were a pure accident, I don't think the necessity of JB to write some things in the scene. Rudolph could have his weapon the whole time and only took it in his hand in the last moments, when he saw Murph killing the Jotun. And before that, he could have been quite groggy but walking on his feet, not needing to be carried by Bradley (which led to the moment of Harry and Bradley discussing what to do with him).