Really, Velen...Really?

You...the PROPHET...couldn't predict that Illidan might react this way?  You want to know who could have predicted that?  

Literally everyone but you.  

Kobolds say very few things aside from "You no take candle!" but if you asked a Kobold how he thought Illidan might react in this situation, he would say "Oh, no.  Illidan's going to lose his shit over this.  Also, you no take candle."