Rescue hostages

Two players of a team play on other two fo other team on a square of 20 meters with the objetive of passing the ball 10 times one after another
The rest of the players (two on each team) will be places outside the square
When ten passes has been done, the outside players will place themselves behind goals, to be liberated after a combination
And so numeric superiorities will be formed inside squares (3 on 2,...)