These things rarely become an issue when things are going according to plan. We have a standard way of doing most things and common sense is used to sort most things out. Only when the unusual occurs do we have to rely people's initiative. An example would be one of the loaders finds a hole in hole in the fuselage or fuel leak, etc. During the arrival and departing phases we have hand signals to communicate and these cover most eventualities. If they are insufficient, we stop, have a look and sort out the problem. Just so long as nobody clever starts to write a protocol or a procedure to help, we'll be fine.
PM