Karl Stemonsen wanted to bargain, which was normal. After just one meeting and a few exchanges, he was expected to lead his brothers to join an entirely unfamiliar intelligence organization. How could that be possible?
Even if it was recruiting cheap cannon fodder, it wasn't that straightforward. If he wasn't in need of the other party, Karl would have started cursing. So, just bargaining was already a restrained outcome for Karl.
It's just a pity that Karl chose the wrong target.
If it were Gong Yang, he might readily agree to Karl's conditions, but Yang Yi wouldn't, and he couldn't.
The main thing is, Yang Yi doesn't have a black heart, but he has black hands.