As an additional cost to cast Liquid Fire, choose a number between 0 and 5. Liquid Fire deals X damage to target creature and 5 minus X damage to that creature's controller, where X is the chosen number.
There's no such thing as a little bit of lava.
Official Rulings for Liquid Fire
5/1/2009 : You choose the number as you cast the spell. If you choose 0, the creature's controller will be dealt 5 damage. If you choose 5, that player will not be dealt any damage.
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