In "Other Women", Alastor and his son Hunter Caine both displayed this ability. It allowed them to sense the Power of Three used by the Charmed Ones when casting the spell to rewrite history. Hunter was even able to determine that the spell involved some form of temporal shift, but neither men were able to determine the specifics of the changes made.
In "Breaking the Cycle", Harry Greenwood and Abigael Jameson-Caine found a strange device. Turning the device on, the two of them soon realized that it was some sort of magic detector that was being used by hunters who were looking for magical beings. Later, using this device, Harry and Abigael found the young witch Cassie.
- Original Power