Could you please take a screenshot from the char, not everyone have a niconico douga account (or even interested in having one) to be able to watch the video. Also, it's part of the forum rules to take your own screenshot before posting.
I don't want to have a NicoNico Douga account, I don't speak japanese, and I'm not that big on anime or gameplay videos, so there's nothing interesting in NND for me to be interested into making an account. I'm not obligated to make accounts on sites I don't use.
It would be the same thing as posting a link to a topic on a forum's members only section. The way you say it you should be obligated to make an account on every single site you come by because I wouldn't bother to take a single picture.
Also, it's the forum's modus operandi to take a picture yourself for the post. I'm not being an asshole for asking just a picture, everyone follow this rule because it make everyone lives better.
