User blog comment:Hidden Scorpius XI/An ever-present detail/@comment-3146930-20150120213220/@comment-3146930-20150121205247

Her power can sort of be summed up using a refrigerator magnet and a paperclip. The magnet will constantly release a magnetic field even if it isn't touching the paperclip, causing the clip to move if the magnet gets too close. No physical contact is required to move the clip with the magnet, but the closer the magnet is the more powerful the field will be.

Now if the paperclip touches the magnet and you leave it for awhile, the paperclip will also become magnetic even after removing the magnet. This will cause the paperclip to be able to attract more paperclips (temporarily).

Pyrrha just has the benefit to being able to control these magnetic fields in whatever way she wants. Her ability is just more powerful the closer she is, which could be said of almost any ability. I'm sure Weiss uses less energy making a Glyph under her feet instead of making one 10 yards away. I'm not even sure where the idea that Pyrrha needed to touch the object in question came from.