Premise: Jon drew and fired into the assassin's face.

Hypothesis: The assassin was going to kill him.
Answer: it is not possible to tell

Premise: and then plus then you for end up forgetting to write it down

Hypothesis: You will also forget to write it down, and then you may end up missing the appointment.
Answer: it is not possible to tell

Premise: Then she turned back to him, nodding.

Hypothesis: She turned away from him and shook her head.
Answer: no

Premise: It's a relatively simple game, where bets are placed by laying chips on a single number or groups of numbers, colors, or odd/even.

Hypothesis: It is a complex game involving strategic thinking.
Answer: no