Artemis nodded slowly. A miracle. He lifted his hand. On the palm there was a slight graze from his climb over the quayside stile. Artemis concentrated and five blue sparks of magic leaped from his fingertips and zeroed in on the graze, wiping it out like a cloth wiping dirt. He had more magic left than he had pretended.
'Maybe we can arrange a miracle.'
Butler was beyond further amazement. 'That's a new trick,' he said laconically.
'I picked up a little more than an eye in the time tunnel.'

The Lost Colony, Chapter 16