I'd imagine they'd want to get the fight over as quickly as possible and not hang around much, just be able to hold out long enough to find a chance to escape. They're quick and dexterous, making them hard to hit. They tend to feint a lot before delivering a blow or two in the hopes of distracting their opponent for long enough to run off or grab a weapon. If they happen to knock them out, that's even better.
In terms of weapons, I think their claws/teeth usually suffice, but if they have to they'll use whatever blunt/sharp object they have at their disposal. Glass bottles, wrenches, rocks, even just throwing sand into their opponents eyes.
Np: A fighting style for seb would be cool
Seb would absolutely own an absolute giant of a dog and protect it with his life