I know that a raised arm wave signals a fair catch. But I can imagine gunners and such sometimes will be in the midst of fighting through blocks or at least have someone blocking their vision for a couple of seconds. Or at the least need to be focusing on what's happening around them rather than looking way down the field early in the punt/kickoff.
How do players become aware of the fair catch? Is there some officiating signal? Or do teammates yell something out to aid one another? Or is this just somehow not normally an issue? It seems players these days rarely hit someone who has called fair catch, or instead hang back too much when it's not... so I have to think there's something. I know officiating made sure to push a full fair catch signal, giving players a little extra chance, but is there anything more to help?