An aftereffect perhaps?

"I get it now!" the Fairy exclaimed. "Either this is someone elses work, or our combined magic is having a tertiary effect, look!"
As they spotted the teenagers checking out their nails, a nearby college girl looked frightened. But her look of fear fades as she rapidly became an intern, dressed as a nicely minted soon to be secretary fit for an office rather than a school.
'It seems so, but how can we be sure?" Lawrence questioned. They both continued investigating.