Possible Clues:

• Square with man working on boat? Satisfied, as tends to go off the handle far too easy!
• Too eager to press for expulsion from chambers
• Irresponsible with firearms
• Set off, content but ready to react violently
• Likely to hit out without thinking
• Risking a fight � as the cowboy was with his horse?
• Over-enthusiastic with a gun
• Delighted to fire with very little justification
• Dwarf goes underneath horse belonging to cowboy quick on the draw
• Rash, what Roy Rogers rode - a dwarf