Hank dropped the shotgun, Apparently their was only 2 bullets. Makes sense in a way.

He ran back to to where he left Murphy and ran in. "Murphy! You here!?" They had to leave, they had enough supplies to make it out, but things were getting bad and were going to get worse, if they didn't leave soon they wouldn't make it out at all. He was still debating on how much to trust the others, he wasn't sure yet. They did help him but he was low on options, and time.