The person in control of the ball is, as we know, designated the first attacker. She obviously has a lot of responsibility when it comes to ball possession and establishing an effective passing game. But the second attackers, those in direct support of the first attacker, probably have equal, or perhaps even greater, responsibility for maintaining possession. Because the second attacker must make herself available to the passer. She does this through movement to space or by a check back towards the ball.
Communication is key, whether verbal, or non-verbal.
Even when they are not good passing options, second attackers can affect the possession and passing game by clearing the area and perhaps opening it up for a teammate to make a supporting run into the vacated space. Each team has either 3 or 4 players and each team MUST wear a different color pennie. One team is on defense and the other 2 teams possess the ball. When the defensive team gains possession of the ball, they switch to offense and the team that lost possession switches to defense. Therefore you always have 6 v 3 or 8 v 4.