You were left behind.

Your friends went forward, when you almost died to a void-mass in a closet. As you tried to catch up, a sudden vent just went in the opposite wall. You was about to prepare flash beacon, when a sudden voice said:

"Stranger, over here."

With a sigh you went in the vent and saw a room with many tables, where different items were on. But you got shocked by the host of that room. It was a fish-like creature, but looked also human a bit.

"Ah, it's you," he said. "Oh, hey. I'll make this quick considering your friends have already met me before. Names Sebastian, and I am just a local, selling his wares, in exchange for any research you probably stumbled upon already before getting here. Simple enough, right?" A little smile could be seen on his face in that moment. "Items on my tail, batteries on the desk next to me, and the keycards on the table beside the radio."

He finally finished, looking at you.