If they were going to repel each other Erik wasn't sure that they would want to find out surrounded by stone fixtures, a solid ten feet above the lawns. Still, it was a good question. Erik stopped his parlour trick before their powers had too much of a chance to interact and the coins fell into Lorna's hand. "We'll find out eventually, after we've figured you out." Until then he wasn't risking it.
He leaned back against the stone. "How much practice controlling your powers have you had exactly?" Some latched onto instinct as he had, some needed hints, and some needed Charles to push them off the top of the mansion. "When did they manifest?"