Ren Xiaosu had only entered Stronghold 63 because he wanted to take a look at the commotion that would be happening. After all, he would not get any reward for completing the A-rank mission. Meanwhile, it was clear the Anjing House had had a feud with the Pyro Company for some time. As such, he was unwilling to get embroiled in this dispute.
But that member of the advanced fighting force from the Pyro Company had to make that provocation and even sent someone after him. This could not be tolerated.