Hertman is Hoyel's Guard Captain, the second-in-command on Star No. 4, and it was he who helped Qu Jianlei obtain his government status.
Their initial interactions weren't very friendly, but they became quite effective in working together later on.
The Guard Captain isn't exactly a great person, nor is he a major villain; he's just an ordinary man with some flaws.
Qu Jianlei acquired the Baofeng skill from him, and the Vortex was achieved thanks to him as well.
Their friendship wasn't deep, and Hertman often had his own little schemes, which were understandable but not pleasant.
Such a person's death shouldn't interest Qu Jianlei in revenge, even if he died unjustly.
Once you enter the government arena, you can prey on others, and they can prey on you—it's all about accepting the consequences of the gamble.
However, the Guard Captain was implicated by Hoyel and thus murdered, which Qu Jianlei couldn't ignore.
