He constructed bombs for the revolutionaries out of salmon cans. According to some sources the incident that took away his hearing made Neri particularly ruthless in how he treated captive prisoners; he either had them executed or he would cut off one of their ears as a "mark of Cain".
Neri crafted explosives for rebels using canned salmon. Some sources indicate that losing his hearing due to an incident made him particularly harsh with prisoners; he either killed them or cut off one ear as a sign of Cain.