User blog comment:AK151/Thoughts on Chapter 4/@comment-92.82.173.121-20140815190116

I think Sun might not have taken that fight too seriously (he was joking with Neptune in the after battle scene about the girls prbably being okay) and that's why his clones got destroyed immediately (his semblance seems to require a lot of focus). I don't think Sun and Neptune are actually that weak when they take a battle seriously.