"See, different for everyone!" Harry had to look away, quickly becoming flustered by their maintained eye contact, "To connect with your magical core, it is key to truly understand how you feel inside your own body. Some people do that by meditating and trying to feel everything, everywhere, all at once. But that kind of connection is many magnitudes higher than what’s required to cast the combat bolt - for this, you need only dip into your core, and it will do the rest, until it is as natural as breathing.  