So this was where their clues would eventually lead them. Cas was aware of what a speakeasy was - it was a place for unhappy humans to acquire alcohol when it was against the law. It made no sense to him, but it was empty. Fairly secluded due to being empty. Whatever Mary's captor had been thinking in choosing it had been correct, but that would merely prevent them from being heard.
What infuriated him was that it looked so nondescript. It was not a place of any import and yet it was everything in regard to Mary's life. And that was if she were even still alive. One wrong lead and they could have arrived at a location that was completely different.
Reaching into the back of his trousers for his gun, he clicked the safety off of it and cocked it, watching Anna out of the corner of his eye for any signs of displeasure. It was something of a formality, of course. Because whether he, Dean, or Johnny got to the person in question first, it didn't matter. All Cas cared about was that they paid for it.
"I'll go first," he said quietly, regarding his mate. "In the event something happens, I prefer it to happen to me first."
She was likely to take offense, but it was simply because her life mattered over his own. Surely she would understand that.