Oh,It's going to be so easy to kill you",scoffed Opal.

Now I can do the bolts," she slurred. "I've been trying to focus enough magic all week."
The magic shifted and swirled, finally etching a picture in the air. It was a rough picture of Foaly, and he was laughing.
I hate you, centaur!" screamed Opal, lunging toward, and then through, the insubstantial image. Her eyes rolled back into her head, and then she collapsed, snoring, on the floor.
Artemis straightened his tie.
Freud, he was certain, would have a field day with that.

I can grow cameras!" she had shrieked at the Brill brothers during one briefing. "Who's to say that despicable centaur Foaly hasn't succeded in splicing surveillance equiptment to plants? So get rid of all the flowers. Rocks, too. I don't trust them. Sullen little blebers.

They have gone. And the tunnel is about to close. So, boys, I am looking for someone to blame.

Butler was seeing the world as it was, complete with L.E.P retrival team

Butler could kill you a hundred different ways without use of his armoury. Though I'm sure one would be quite sufficient.