So Stone, was it you left holding that massive stash of Tech Pan that got sold here a few times?

RZ has a lever on the side to disable double-exposure prevention. Move the lever to M and it'll let you fire anytime. Using RB backs (including the 70mm; they didn't make an RZ 70mm back) requires use of the M lever to fire because the RB/RZ adapter plate doesn't handle the interlocks correctly.