The best decision would be to wait for Kai and the others to come. Why though? Hayla was in danger, and if something happened because of Arthur's latenesses, he would never forgive himself.
Arthur took a few moments to seize up the situation. Most of the people there weren't particularly strong, only level 20.
It was a good sign, a sign that gave Arthur the confidence he needed to rescue his friend Hayla.
"Sadly, its night time, or else I could use my Void Step to get there easily." Arthur thought.
After a few minutes of just watching, he deduced there were only about 4 people in there, all of them with the level of 20.
Some people would find hard to go up against that squad, but Arthur did not feel a threat at all. With his superior body, he could get to them before they could even react.
The first victim was one guy who went outside to pee. He was near a bush, somewhat far from the cabin. Maybe the man did not want anyone near him when peeing.