Pike just quirked an eyebrow. He was pretty sure there was no need to be all Mission: Impossible about this unless one of these guests happened to be a secret agent, but Heather seemed to be enjoying it and there was no reason to burst her bubble. So he just waited and watched, a little tiny spark of amusement dancing in his eyes for just a second.
When she said she was going to lock the back, he just grunted briefly and nodded. Then he waited, hands stuffed in the pockets of his jacket, as he watched her set things up. He wasn't really sure what she had in mind for the set-up, so he just watched as candles lit up, one by one. It didn't provide much light, but it was enough. He didn't need bright lights to drink and mope. He could drink alone in the dark, which maybe said more about his mental state than he was letting himself realize. At her comment about the place and the plans for the basement, he couldn't help but smirk a little. "Little hidden bar. Like one of those prohibition speakeasies. I like that."
It would be impossible to really hide from the guests, considering the manager could wreck any plan for that they came up with, but it was a nice thought.