It was not just a simple act of killing.
Using them as baits, treating them as slaves, killing them simply because they were in bad mood, and even many other immoral acts.
Feng Ao Kuai had seen them with his own eyes performed by a commander from Fei Yang Kingdom when he was younger. But with his qualification back then, he couldn't even do anything to that commander.
So…
He simply let that commander fought on the front and died under the enemy's hand.
Feng Ao Kuai closed his eyes.
He knew that he was not a good person and also someone who thought too much. It was obviously not his business, but watching the supposed comrade treating people like treating trash…
He couldn't stay silent.
Even if he knew that it was wrong to go against his own comrades, Feng Ao Kuai couldn't just let it happen in front of his eyes.
Thus, he simply let the commander died and acted while he was late as the reinforcement.