How violent an action truly is is irrelevant when deciding whether a murder was premeditated(first degree) or not(second degree). If I swing a hammer at a wall and someone happens to be passing by, I hit them in the face and kill them, it's going to look very gruesome in slow motion. That doesn't mean I intended to kill the person. If a jury is more likely to think I had time to notice the person passing by because of slow motion and thus believe that I intended to kill the person, then that's an error.