Wil: Is that an online rule book? Can you post the link.
I'm wondering about the safety...my guess is that was added last year. Remember how the rule used to be on an interception or fumble, if the player's momentum took them into the end zone, they would give them a touchback...and then last year they changed it to, if you're in the field of play and take the ball back into the end zone even if unintentionally, it's still a safety. I guess that would have to be the case on a 2-point try (but still only worth 1 point).
That's a rambling way of wording it, but I hope everyone knows what I mean.