Two butchers are walking through their shop.
The owners of a very famous meat market are getting ready to open up shop.
We have no idea if they are getting ready to open up shop, they could be closing it. We have no idea if it is very famous or not, ti could be any store.
Two butchers are walking through their shop are not necessarily owners getting ready to open up shop.
Two butchers don't necessarily own the shop, their shop is not necessarily a famous meat market, and walking through a shop does not necessarily mean they are getting ready to open the shop.