If the ball passes out of the field across the assistant referees and of a touchline and immediately returns to the field and play continues the assistant referee should signal by doing which of the following

If the ball passes out of the field across the assistant referees and of a touchline and immediately returns to the field and play continues the assistant referee should signal by raising the flag vertically in the hand that is going to be used to signal and then after the referee blows the whistle, indicates the correct direction of the throwing. 

Answer8.0m;