It's heavier than "FV" which is "fantasy violence", the type of violence allowed for a TV-Y7 show. Clone Wars is a TV-PG (parental guidance) rated-show with a warning of V for violence, and then Cartoon Network calls it "moderate violence" to explain to parents that the V isn't excessive or bloody but there is more violence than a FV show, that's why CN puts a special ratings splash screen on it and why it doesn't get listed as kids programming in programming guides. Basically, it's "moderate" in that it's the medium level of violence in the TV parental guidelines ratings system, it's more violence than a kids show but less than a TV-MA or TV-14 show's violence where there's more graphic depictions of violence, as well as gore and blood.
The previous episode, Eminence, Cartoon Network censored out a result shot of the heads of the Black Sun being cut off:
http://www.bigshinyrobot.com/reviews/archives/47714
so I would guess Cartoon Network felt that would violate the TV-PG-V rating they could give it, and they couldn't air a TV-MA-V show on a Saturday morning.
What do you mean by paradoxical ending?