If a member of their clan was killed by an NPC, the Pig Demon King might not be that angry, after all, the struggle between the two sides wasn't a matter of a day or two. If every clash was so concerned about casualties, it's likely that there wouldn't be such a balanced situation between the monsters and the NPCs now.
Compared to the casualties of fighting with NPCs, monsters give much more importance to losses from disputes within the same camp.
In the eyes of the Pig Demon Clan, no matter what they were initially planning, Zhou Tian already occupies that checkpoint. He could have just driven back the Pig Demons they dispatched. Why did he need to annihilate the Pig Demon squadron? If Zhou Tian were an advanced monster, the Pig Demon Clan wouldn't say anything. But the fact is, the strength of the Beastman Tribe is even less than the Pig Demon Clan, which naturally made the latter feel uncomfortable.
