That reminded me of something yesterday, which I wanted to clarify, as I've seen it happen quite a few time, we've done it too, in our last league game.
Normally you can only call a timeout when you have possession, and surely the moment you score, the other team gain possesion, in theory they can start attacking straight away, and cross/shoot as soon as the opposition cross the halfway line.
By calling a timeout after you've scored you are removing that advantage from the opposition.
Time-outs
The referee reserves the right to stop game play for any reason. To do this they will shout “Time out”.
Time-outs will/can be called for the following reasons:
After a goal is scored, a time-out can be called for a mechanical, etc.
The ball goes out of play. The game will be paused until the ball can be retrieved. The last team who touched the ball will then concede possession of the ball and play will resume. The ball will be placed on court where it exited the court. Play will resume on the referee’s call.
Mechanical problem. The team with the mechanical problem may request a timeout only after they take possession of the ball.
http://www.londonbikepololeague.com/rules/
Time-outs
The referee reserves the right to stop game play for any reason. To do this they will shout “Time out”.
Time-outs will/can be called for the following reasons: