        Trixie concentrated for a moment, mingling her magic with Twilight’s, slightly augmenting it, and giving it direction.  They had been doing this a little, when Twilight was struggling, since Trixie was much better at demonstrations than scholarly instruction, so it was not too difficult for Trixie to latch onto Twilight’s magic and add a little focus to it.  The trick, of course, was to do so without startling Twilight, who was hypersensitive to her own magical field, given her propensity for magic.