Consider the following premises. There is at least one x_2 for which x_2 will drink water or x_2 is not a bartender. For all x_2, if x_2 drinks water, then x_2 is a bartender. Can we infer the following from them? There is at least one x_2 for which if x_2 were a bartender, then x_2 is drinking water.
Yes.