Like i said before, if they have keets, the whole flock can become very protective, with reason! I have had free ranging guineas for years, and when ever people come here they are always a source of entertainment and wonder to people who know nothing about them. I have a yard sale on my front lawn every year or two and people are very crurious about them, taking pictures, asking me if they can keep stray feathers they find, and asking alot of questions like; What kind of chicken is that? Or Is that a pairie chicken? Or they will hear the guinea before they see them and look a little allarmed or concerned about what is making the noise.
So i see this as a plus for your friends u pick orchard, providing the flock does not have young keets.
I had one female guiney hatch a clutch of keets once, and the entire flock became serigate parents, ultra loud and on edge. We have a stand of blue spruce and one day the guineas were making ear spliting noise, and when we looked out there was a coyote facing off with the flock. He would step twards them and they would move away but not run (keets somewhere close). The coyote was laying his ears back in a way that dogs do when a noise bothers them and he would then back up. So back and forth they went, meanwhile giving my husband time to grab the rifle and dispatch him.