In verses 18-19 the author tells the reader background information about how Judas died and what people called the field where he died. This is not part of Peter's speech. (See: [[rc://en/ta/man/translate/writing-background]])
Although Peter is addressing the entire group of people, here the word "us" refers only to the apostles. (See: [[rc://en/ta/man/translate/figs-exclusive]])
"the money that he earned from the evil thing that he did." The words "his wickedness" refer to Judas Iscariot's betraying Jesus to the people who killed him. (See: [[rc://en/ta/man/translate/figs-explicit]])
# there he fell headfirst, and his body burst open, and all his intestines poured out
This suggests that Judas fell from a high place, rather than just falling down. The fall was severe enough to cause his body to burst open. Other passages of scripture mention that he hanged himself. (See: [[rc://en/ta/man/translate/figs-explicit]])