That attack should never be parryable. That's it. Lawbringer is supposed to punish players by counterattacking, and ALL of his attacks are now parryable, which makes him a hard to master hero but without an optimal use for him. If you attacked with a top heavy relentlessly and your opponent can parry it, you should be punished, as most of the others characters can do.
It would be nice if Lawbringer could keep that. He has little to nothing at the moment that can reward his hard work for getting a good parry. Every basic combo of his includes a heavy that is so slow it becomes a massive parry magnet for the opponent. Top heavy for the stun? Nah, you can't even hit that with a GB. Also his bread and butter shove combo relies on a readable GB so the opponent doesn't block everything. That with his unsafe combos and high stamina costs really hurt. You need fairly good stamina management or else you get punished easily. Besides, it's an easy dodge anyway. You can punish pretty much everything in the Lawbringers kit. Not much is safe. At least he has a lot in the kit.