Nikon SB-5000 Reference Manual page 117

(flash function canceled) mode:
Remote flash units do not fire, even when the master flash unit fires.
v
To prevent the flash units from firing accidentally
Do not leave the flash units' power on during direct remote wireless
multiple flash-unit photography. Ambient electrical noise caused by static
electricity or other such electromagnetic waves can trigger them to fire
accidentally. Always turn the power off when not in use.
Taking a picture with direct remote wireless
multiple flash-unit photography
1.
Remote flash unit setting
Press the rotary multi selector
2 to highlight the flash mode.
Use the rotary multi selector to
choose a flash mode, and then
press the OK button (0B-6).
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