"We need to check for survivors. There are a lot of places on the island for people to hide. We also need to deal with any lingering undead. They don't have anything to control them right now. They could be going wild and killing whatever they encounter." Walker caught on to this danger right away. He knew the dangers of the undead that the immortal king had created.
The worries that Walker had were only growing as he looked at the surroundings with even more detail. The number of damaged tents was much greater than the number of untouched.
This made him realize that the attack must have happened at night when the majority of the researchers had been sleeping. It was a despicable way to fight, but for the immortal king, it was just the amount of evil he would commit.