It is not as if they need any reason to attack others apart from wanting more divinity. But this time they have a very good reason to try and cull their enemies first.
Their attack took the gods off guard. They died in swarths. Most of them scattered in fear because of the carnage. They were too busy running for their lives to notice Legion-4's special state. It was only a few that noticed their odd state and suspected them of claiming the domain.
One of those astute gods shouted, "He has the domain."
This roused the gods. The highly coveted domain made them prioritize something other than their life. They became bold enough to stop. But they were not as bold as the person who shouted would have liked.
It is true that the Orc Bandits have the domain, but it doesn't change the fact that they are very strong. So the gods paused uncertainly as they waited for someone to take action first.