Sentence 1: Ranches (ranchos) and stables are scattered over both islands, so you can hire a mount and go off horseback riding.

Sentence 2: Horses must be bought for riding, they cannot be hired.
Is this second sentence entailed by the first?

Answer: no

Sentence 1: In a 1985 memo, Neuharth threatened to transfer out of the country any editors who sloppily allowed America or Americans into the paper when they meant citizens and residents of the United States.

Sentence 2: The difference in these two terms creates an entirely new meaning in the papers that include them.
Is this second sentence entailed by the first?

Answer: it is not possible to tell

Sentence 1: I wasn't just frozen and brought here by some time machine?" Sather Karf stared at him blankly.

Sentence 2: Sather Karf had a look of confusion over his face, not comprehending what he had just heard.
Is this second sentence entailed by the first?

Answer:
it is not possible to tell