They didn't. Likely Hagan brought them in another way. If you lured them down through the secret door that Yustissa told you opened into this very chamber, the wards would have likely fried the orcs. That's one rather complicated way of escaping though, but your pursuers would have had to take the loooong way around or get some nasty shocks.<br/><br/>Also, protip: You can only charge in a straight line. You can't move through the hemisphere in the center. Pillars and thrones provide cover and obstruct a square of movement.... Also, lots of space on the balcony outside.  O:)