Yea, it's poise, Black Knights have extremely high poise, some of the highest for a humanoid enemy in the game. But it's also the hyper armour they get when they swing their weapon (benefit of a Str build), Tsorig was actually getting staggered on one 2-handed attack of your UGS because it was doing more poise damage than his total poise. The heavy-stagger on his standard 2-handed attack is wild though, even with an UGS he can still true combo you with the follow-up (because heavy-stagger) and then it's usually always RIP. Stupid fact: you can actually block the lava with a shield. Use a shield with high fire damage absorption for best results (hey you actually just got one of those shields).
Yea, it's poise, Black Knights have extremely high poise, some of the highest for a humanoid enemy in the game. But it's also the hyper armour they get when they swing their weapon (benefit of a Str build), Tsorig was actually getting staggered on one 2-handed attack of your UGS because it was doing more poise damage than his total poise.
The heavy-stagger on his standard 2-handed attack is wild though, even with an UGS he can still true combo you with the follow-up (because heavy-stagger) and then it's usually always RIP.
Stupid fact: you can actually block the lava with a shield. Use a shield with high fire damage absorption for best results (hey you actually just got one of those shields).