User blog comment:Zephyrcoil/RWBY Volume 2: Commentaries and Other Information/@comment-11188061-20141127110333/@comment-11188061-20141127153957

Except that he'll be completely trampling over Ozpin's friendship, although his army running amok and subsequent takeover trampled about 99% of that already. Not to mention he'll be cementing his reputation for the general who goes 'all out' and leave no troops behind. The enemy can't possibly be smart enough to raid my unguarded base!

They mentioned it in Volume 1's commentary.

On the nose? I thought they were trying to set a darker tone for Volume 2, so splattering blood seems like a nice start. Instead, we had a completely bloodless run where the show seemed to be ran for kids. Although I have no choice but to agree that not splattering blood was the right decision, because overall the show up till now had shown zero hints of grimness or darkness whatsoever - it would've been jarring to have two different atmospheres clashing with each other. The World of Remnant - Grimm was scarier than the entire series combined.