That's what happened!, the old people always said that when someone claim they're seeing things. Don't ever let them go anywhere or do anything until the problem is solved. In my family we have codes, my mom always assure us kids to said "hey, I feel shy here" when ever we go fishing, haunting, camping, or swimming and see or notice something out of the ordinary. And if one of us use the code than the other should follow alone and said "okay, lets go to a different area" but than instead of going to another location, just head straight home to be safe. The reason of not describing what you saw than will keep everyone calm, and to said to go somewhere else will trick what ever it is to go and wait at that location and go home. I hope this make sense to some of you guys.