Let's say that one night on a harbor port a Mershark up and found her way, somehow, into a bar. She would pay, of course, in full. Burly sailors and roughneck men would look at her, blinking as if they'd now seen it all.
Ordering some high-inducing beverages, she will would pay the barkeep in full. You are sitting a couple of seats from her, and notice she's got a bottle of high quality booze. Doesn't even need a cup as she drowns the container in five minutes.
By this time shes a bit woozy, and asks the bartender to server her of a KEG of the stuff. The once populated bar is now deserted, the sailors and other patrons getting out quickly, though only one could surmise why. You are still sitting there, when the keg comes out, you would have wished you'd left sooner. The real question is...
Even if she is a Mershark, she is still a drunk girl. I do the good thing and ask the bartender about where she is from, and take her home. I leave a note, reading "You got wasted at the local bar last night. Figured you needed help getting home. Ever need a drinking buddy again, call me. From - Marcus"