Example of defense techniques and spells:
First, Harry Potter universe:
- "Shield Charm" (Protego) is used to stop the spell (existing spell).
- "Reflect/Redirect Spell" (Pondero?)can be a shield or just counterspell used to change direction of spell. I don't know if similar spell exists.
- "Mirror Shield" (Repello?) to redirect spell back to caster.
- Use local version of Teleport spell to change places with opponent while missile like spell is cast (i.e. with finite time of flight, no homing, disconnected from caster)