A cast was made of Henn's upper body and her stunt double's legs to construct a lightweight dummy for Weaver to hold when carrying a gun; Henn's weight plus a gun would have been too heavy. Goldstein had also not handled a gun before, and held her weapon incorrectly in closeups; Hurd stood in for her instead. The flamethrowers were functional. The art department had covered the sets in an unspecified substance to artificially age them; the flamethrowers vaporized it, causing fire and heavy smoke. Goldstein struggled to breathe, and (since improvisation was encouraged) Paxton thought she was acting until he also became breathless.