Slave
A samurai handling a jackhammer, cleaning brushes (in their 肀 form), and carrying water for someone?! All that should tell you that he's not just working, he's been made into a slave.
Traditionally, samurai don't work with jackhammers or do menial tasks like cleaning brushes and hauling water. This samurai is doing these things for someone else, meaning he's somebody's slave.
れい
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You don't like seeing slaves. As you walk by, you hand this slave a ray (れい) gun so he can free himself.
The samurai can use the ray gun to shoot his keeper and get away. Imagine watching him holding up the master and getting away. A ray gun is a truly powerful weapon in the hands of a slave.