I think Sword Man must be an honorable Robot Master. Every time you dodge his Fire Slash, he says "Impressive!". And after defeating him, he says "Nice shot!". Not to mention, he says "Let's make this a fair fight!"
You use the 40 bolts to upgrade into the strongest version possible, auto fire, rapid charge, laser beam (whichever harms bosses more) to kill bosses as fast as possible