To be honest, the writing for this story scene is quite bad. This scene effectively says that the story could have ended with little bloodshed if not for Anduin screaming "Noooo" uncontrollably. It diminishes Alduin's character and implies that anything from here on could have been redundant. If I was the writer, I would have had Alleria be detected, then miss, so the fault isn't Anduin - the former scenario trivialises Anduin.
To be honest, the writing for this story scene is quite bad. This scene effectively says that the story could have ended with little bloodshed if not for Anduin screaming "Noooo" uncontrollably. It diminishes Alduin's character and implies that anything from here on could have been redundant. If I was the writer, I would have had Alleria be detected, then miss, so the fault isn't Anduin - the former scenario trivialises Anduin.