Full Idea
Powers are 'multi-track', meaning that they are capable of producing a variety of different manifestations when me with diverse stimuli.
Gist of Idea
Powers are 'multi-track' if they can produce a variety of manifestations
Source
Neil E. Williams (The Powers Metaphysics [2019], 03.1)
Book Reference
Williams,Neil E.: 'The Powers Metaphysics' [OUP 2019], p.49
A Reaction
He later mentions magnetism. Not convinced of this. Powers probably never exist in isolation, so a different manifestation could be because a different power becomes involved. (Bird is a single-tracker).