Potentials refer to the people who have the capability of conjuring and harnessing magic. Once Rowan is made aware of a Potential, each Potential goes through a series of tests to determine whether or not they are able to control their abilities and if they can enroll into Rowan. When Byron Morrow revealed the location of several potentials, they were kidnapped by Marley Augur and the vyes, who evidently thought  that they were 'saving' the potentials from the same fate as Marley Augur . Max amplified himself to rescue all of the students.