Hmm. I think Warren's go-to style would be pack tactics. He's rarely alone if he ends up getting into a fight, and since he's a big guy with a sword and a shield he appears to be a fairly threatening foe. By drawing attention of someone in combat and keeping it, he's able to let them get pummeled or skewered or chopped in two by someone else on his side.
In a purely one-on-one affair that isn't the Grindstone, Warren is usually reticent to get into a fight. If he absolutely has to engage, he seeks to disarm his opponents to try and get them to back down. If they are particularly spirited in their aggression, sometimes that means aiming for wrists or feet or knees. He's also not afraid to let his armor or body take what would not be a lethal strike in the hopes of landing one of his own to bring an end to things.
In a purely one-on-one affair that isn't the Grindstone, Warren is usually reticent to get into a fight. If he absolutely has to engage, he seeks to disarm his opponents to try and get them to back down. If they are particularly spirited in their aggression, sometimes that means aiming for wrists or feet or knees. He's also not afraid to let his armor or body take what would not be a lethal strike in the hopes of landing one of his own to bring an end to things.