Stephen was shocked when he overheard about a hunt, but managed to conceal it. This was something bad, and Carlson needed to know. 

Stephen walked back into the bar, and found Carlso.  Stephen lowered his voice so that people didn't overhear, and told Carlson, "I think thise people were hunters. We have to be careful, they said something about a hunt, probably tommorow night. I can follow them if you want."