Por metal se refiere al material con el que está elaborada su espada, es decir, Roldán se refiere a que es probable que primero lo atraviese con su espada antes que pueda apropiarse de dicha mercancía.
(By metal he refers to the material with which his sword is made, that is, Roldán refers to the fact that it is likely that he will first pierce it with his sword before he can appropriate the aforementioned merchandise)
