One of the iron rules:
"Thou shall not give useful comments on fanfiction.net."
because if you do you get
a) obnoxious replies about "not getting the story"
(isn't the author's job to make me get it - as long as I attentively read the fic?)
b) aggressive replies
(from people blissfully unaware whom they are talking with until they gave that reply)
c) an explanation that it will explain itself later in the story
(excuse me, but physically impossible cannot be explained later on in a real world fic without magical elements)
d) [my personal favorite]: It isn't necessary to indicate each moment passed to tell a plot.
(too true, but the essential moments to give the continuity are not part of the ignorable ones)
time to keep in mind the three golden rules of reviews:
1. even a good fic may have a moronic author
2. people ask for your criticism, but they only want praise
and
3. thou shall not review on ff.net.
It's not worth the bother.