Yeah; I noticed that too - but the audience was very kind and didn't yell straight out! Such things are so easy to do when your gob's working just ahead of your brain!
Thanks to Sam and the gang for an excellent day. Sam should be employed as a professional caver herder, "get back in we're starting" and a hoard of cavers went back to their seats with zero faffing. Never see that at the Dump on a club trip.