The word "All" is a generalization. Alternate translation: "Those who heard him" or "Many who heard him" (See: [[rc://en/ta/man/translate/figs-hyperbole]])
This is a rhetorical and negative question that emphasizes that Saul was indeed the man who had persecuted the believers. Alternate translation: "This is the man who destroyed those in Jerusalem who called on this name Jesus!" (See: [[rc://en/ta/man/translate/figs-rquestion]])