Open up act_move.c in the move_char function find
act( AT_ACTION, "You follow $N.", master, NULL, ch, TO_CHAR );
change it to this
act( AT_ACTION, "You follow $N.", fch, NULL, master, TO_CHAR );
It's just changing the master to fch and the ch to master.
Couldn't you just picture like 4+ people following someone and the master getting all these You follow <yourself> messages...