It's not easy being green
The market is bursting with strange aliens milling about, exchanging goods and services for federation credits and other foreign currency. The specifics are lost on Keenser as his line of vision is limited to the waists and legs/ tentacles of the alien shoppers but even down at his level the spices wafting from the stalls burn his nostrils. In the disorder that is the bazaar it doesn't take long for his hand to lose its grip on Scotty's. The tide of people drag him away, pushing and shoving him in all sorts of directions until he can't remember the way back to the ship and is sick with dizziness.
Eventually he finds himself along the edge of the market, where the stalls are more spread out and the crowds less thick. Keenser searches his pockets for his communicator but only finds the packet of sandwiches Scotty had made for him. Biting in to cheese, pickle, tomato and chunks of perfectly normal beast he tries to formulate a plan.
At first he tries to locate Scotty using their telepathic link but discovers the planets magnetic energy causes too much of a disturbance. He then resorts to look for some of the other crewmen on shore leave, a task that proves difficult despite their highly recognisable uniforms. Asking the locals proves problematic due to communication problems, namely they don't seem to understand standard and keep directing him to the nearest toilet.
Frustrated and tired he decides to rest for a bit underneath one of the strange lumpy purple trees. This proves to be a mistake for its pollen quickly puts him to sleep. While asleep Keenser is captured and dragged to the auction arena to be sold. Somehow he manages to sleep through the bidding war that erupts over him and the argument that follows which involving phasers and some random redshirts dying. Eventually he comes around on one of McCoy's biobeds with Scotty leaning over him that he even realises he's somehow found his way back to the ship.
"Sup man? wanna sandwich?" asks Scotty holding out a plate.
"Alright"