User blog comment:Purehito/What is your favourite magic and what magic would you like to see in the next FT arc?/@comment-3273232-20130626133237/@comment-4829046-20130626163611

Here's the section from the wiki article

"After the timeskip, Racer's mastery of this form of magic has increased to the point where he is able to easily outmaneuver Doranbolt's Teleportation Magic and make his attacks more unpredictable than ever before; though such boost of power required the sacrifice of Racer's "heart" to be attained.[34] In this improved version, he seems to make use of a suit that glows to make himself faster.[35]"