So, we had a mini-climax in my campaign on Saturday. It was essentially the players finally removing a fairly important villain. He was designed to be a challenge and had enough followers with him that it should've been a very hard fight with lasting consequences depending on how crits and such went.
And...
The PC who is essentially a tank just stunlocked him with a weapon that had concussive 2 on it. For pretty much the entire fight. Even with Nemesis 2 dice upgrades. Generally the other PCs went before him and passed him any blue dice they got from their own attacks.
Is there a way to prevent this from happening again? Concussive just seems too overpowered. It got bad enough he started keeping the only other threatening NPC stunlocked as well and they just killed everyone else in the fight then came back and took care of those two. It made the entire thing extremely anti-climatic.