If you are talking form a grammatical point, the subject of "the warm inventor" would be the word "inventor".
Answer:
It seems like you missed the actual text part of the question
Explanation:
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Katniss and Rue remain up to steal there food/supplies. Rue will set a fire to distract the careers while Katniss was to go destroy the supplies. but upon her staking out the items while the careers run to the fire source, Katniss realizes there are land mines placed around the supplies, so she shoots a bag of apples with an arrow and watches the fiery explosions from the impact of the mines.
