From what Arvin could observe he could see that this place was the secret meeting room of the bigshots of the Cullen family. So Loki's hunch was right. But now the question was what does it got to do with the old man. The youth that Arvin came with spoke in such a manner that the old man was the reason that this meeting was called. That arouses another question, whether this meeting will be harmful or fruitful for him.
He knew the chance of it being fruitful is less than 5%. Plus the stares that he was getting from the people sitting in the area gave Arvin a very good idea about what is going to happen. So he decided that he should be prepared for the worst.