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 created explosives using canned salmon for revolutionary purposes. Some reports suggest that losing his hearing due to an incident made him particularly brutal with prisoners, either executing them or cutting off one ear as a sign of Cain.