Arlene was apparently impossible to surprise. She must have excellent control as well, either that or she was familiar with such things. It was hard to tell from the way she reacted.

"Yes, but this place reduces a persons ability. It's like they want us to be on a more level playing field. Either that, or they're afraid that we would over-run the facility if everyone had free reign. I would not still be here if I wasn't reduced to the level of ability I had when I first started," Come to think of it, this facility probably wouldn't last thirty seconds if everyone suddenly got access to their abilities.