STEP 6: Let's cast a fireball spell! We will do this only if the user chooses a or the computer randomly selects "a".

• Locate the if statement in cast_spell(). Replace the first pass with this function call: fireball(caster)

The fireball() function also needs to know who cast the spell, so we pass it the caster sprite so that the function knows where to throw the fireball!

• Click Run now and choose option a to cast the fireball spell!

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