It was unfortunate to see rising Manly star Tom Trbojevic injured during the Sea Eagles' clash with the Broncos on Saturday night, but I don't think the rules need to be changed because of what happened. Defending players have rules in place to protect them when they are contesting the high ball because the attacking players have all the momentum and the defender is a sitting duck. But once the ball is allowed to bounce it is fair game, no matter which direction the ball goes after hitting the ground.
You simply can't make rules to cover every possible situation because it may lead to an injury.