Karl set up his hammock between the wagon axles and stretched out for the evening. In his armour, he would be plenty warm enough, so there was no need for a blanket that would hinder his response time if they were attacked.
He had thought that they would have plenty of warning before anything reached them, but just before dawn, when a Portal suddenly opened in the camp, he only had a few seconds warning to roll out of bed and get his bearings before the first attackers were coming through, twenty metres away and creeping through the dark.
They must have thought that the Naga couldn't see them, even though Naga could see exceptionally well in the dark.
The reason why they were so confident became obvious when they Shadow Stepped behind the Naga warriors and tried to slit their throats silently.