Agree with what has been said already. When playing with mine with as pups, it they did bite we would stop play immediately and sometimes make a high pitched sound as if we were in pain.
I was watching my 2 cockers play last night. Herbie bit Mikey, he just got carried away and bit him. Mikey screamed out and stopped play immediately, he looked very hurt and would not give Herbie any eye contact at all. Herbie then tried for a minute to get him to play but he knew he's overstepped the mark so then resorted to plain old doggie creeping, wagging his tail and whole body and trying to get Mikey's attention by sculking around him, licking his face nuzzling him. Within 5 mins they were playing again, this time without biting.
So if that's how dogs stop play biting, I guess it would work for us humans too