Possible Clues:

• Impetuous person gets cold feet? Quite the reverse
• He had to change, being the impetuous type
• Person liable to get reckless impulses, as opposed to cold feet?
• Someone rash involved in striking match
• Madcap put article in stock right away
• He had to act wildly
• The daredevil is the one in the brick container
• He had to? That's silly. He's foolhardy
• Impulsive person
• Daredevil girl gets into transporter on building site