Did you watch/enjoy it? >_>
Also, Neille purposely made the goob go berserk so that his party (himself, F'lhaminn, the lala twins and the roegadyn) could be billed as Ul'dah's "heros" once they took care of the goob. Then Thancred showed up and stole his thunder LOL. His party is naive in their ideallistic quest, and so they weren't seriously counting on casualties (collateral damage).
They passed out the flowers because it was believed that they were rare and warded off beasts. Prior to the parade, Neille was said to be buying them en-masse. He even buys the one the player has. Neille knew what the horn could do, it wasn't a matter of making the parade a better show.
Here's some more screengrabs of the horn to satiate your thirst for knowledge! It's enormous compared to the Limsa one (Sthalmann was holding it in his fingers almost, whereas the Ul'dah one..damn its big o_O)
