"It's the barrier you need to watch out for," he told her, lifting a device. It glowed, sounding out a beacon of light that pooled against the wall for a moment before bursting through and disappearing into the distance.

"We've had to raise security of late. There's been some suspicious activity around the borders..." There's a shimmer as a seven by seven square foot of the air seems to shimmer.

"It should be safe now."