Safety (try)

[cowbyfan1]

Rule book says a successful try scores 1 point for a field goal or safety by B. How can a safety be scored???

A try ends when:
1. B secures possession
2. it is apparent a drop kick or place kick will not score
3. try is successful
4. ball becomes dead for any other reason.

I have racked my poor little brain and cannot think how that safety would be scored. 8-p

The only thing I come up with per 8-3-3 is say the QB for A runs 97 yards the other way and get tackled by B in he end zone, then 1 point for A (on a safety by B by the way the rule reads). I know, that makes no sense.

Enlighten me!!!!