Re-shoot
Rule 4.6 Range Equipment Failure
If you don't get to yank on the rope to try it out first He probably had no idea it wouldn't activate it, don't penalize the shooter for a poor design.
All respect to Tom but, it isn't the same as an activator box because this prop is not a common prop, anybody who's seen boxes know you better stomp it good The exception to this would be if the RO explained that pulling it straight back was the only way to activate it.
Bottom line for me, if it's a "circus" stunt, design it to work. If it doesn't, be prepared for a long day of reshoots.