the points blacksheep made are also reasons why experienced players laugh at snipers. remember, this is paintball
, and paintball markers & players do not follow the same rules as firearms & soldiers.
(try not to shoot if they're moving, if they are then aim where they will be in a when your ball arrives)
as blacksheep said, this is horrible advice. anyone with common sense doesn't stop moving until they're behind cover, and they're easier targets when they're in the open. not taking a shot when they're most vulnerable is stupid.