So I've done this sort of setup where the flyman cannot see all or part of the pipe being flown several times. I've always used a spotter positioned where they can see the entire pipe (or multiple spotters if necessary). I'm being questioned on the necessity of a spotter on some moves (in show and rehearsal) on grounds of theres nothing close enough to catch and no one directly under. My opinion is anything can happen (cable tie-off slip, mechanical issue with the fly system, or an actor is in the wrong place.) so there ALWAYS needs to be someone with an eye on the pipe ready to call a stop. Am I being silly over this? Whats your protocol for when they flyman cannot see the pipe/goods?