Lots of guides have something negative to show you. Heehee In that many guides are also watching their divers, more often than not, they'll exhibit bad form by being more vertical than fully horizontal but their bouyancy is amazing. The other thing many guides do, but shouldn't, is rush to the surface from the stop. They will be doing this because they need to take care of their divers. It's a behaviour that you don't want to emulate. Ascend very slowly upon the completion of your stop, using your breath to bring you up (at this point you should very definitely not have any air in your bcd unless you've been overweighted)