Don Ignacio was called before the Inquisition to give testimony following Don Guillén's arrest, but as an Indian, Don Ignacio was exempt from the tribunal's jurisdiction. Don Guillén was also concerned with black slavery, seeing it as another injustice, and slaves as potential supporters. In a psalm he wrote in 1655 while imprisoned, he asks why Spaniards who claim to be Christians are involved with slavery. "Why do you buy and sell men as if they were beasts? … They are unjustly sold to you and unjustly you buy them. You commit a savage and cruel crime before God…."