Passers are already op with the current Bruiser setup. But if you're a Passer that's getting hit by a Bruiser then try counting 6 seconds after you get hit as that's your free time to figure out a way to evade them.
As for that Quidditch lore that you brought up - I've been lucky enough to get hit by my own stray bludger a few times, but having to catch that bludger aimlessly flying around? You're joking, right? With the bruiser's broom speed and how fast the bludger flies - that would essentially be a Searcher role but in hardcore mode.
Plus, this idea would really extend the Bruiser cooldown in a way if you're making the Bruiser find the bludger.
If they did incorporate your idea, I think that they would have to do a few things to rebalance the position -
- Remove all of the cooldowns since the time spent finding the bludger is essentially another cooldown.
- Increase the bruiser broom speed.
- Definitely figure out how to make the bludger glow only for Bruisers - because right now the Quabble glows for every player and having another glowing object could cause confusion.