So that's why he brought all that potion back in chapter 1.
Doping against the exhaustion with potion.
I guess that's also why the general seems a bit confident confronting him, he brought reinforcement and know MC won't last in a battle of attrition without the backing of the Kingdom conjuring infinite potion for him to use.
Guess MC having sympathy and helping the demi-human, and thus put MC near windblade, a safe escape route, is out of the general's expectation. Justifiable since you won't think that someone killing demi-human for living would have sympathy left for them.