[Bluefoot]

Men's ASA SP. Field has no foul lines drawn on it. BR hits fly ball down right-field foul line, and runs towards 1B. BR's back is to PU who is standing at home plate to judge where fly ball lands. Ball lands just inside fair territory. PU gives fair ball signal with arm extended towards fair territory. At same time, F2 loudly yells "Foul ball!"
BR (who does not see PU indicating fair ball) reacts to F2's verbal call and stays at 1B. F10 then throws the ball back in.
If F2 did not yell, BR may have been able to reach 2B safely.
Should PU award BR 2B?