What is the role of the 2nd referee in the volleyball game?

Answer 1

The second referee is called the 'down referee,' who watches for players who cross the line of the court, contact the net, or setters who jump/back row attacks. They also signal for player substitutions in games, and work with the 'up referee' to call balls out and in.

Answer 2

He just reinforces what the first ref says, or fights wrong calls.

Answer 3

he does the same as other referees in other sports