How does strangulation work?
It’s unclear how the rules on page 214 interact with the grappling rules on page 152. You’re right; those rules are unclear. Use the following rules instead of those on page 214. (These rules completely supercede those under the Strangulation header.) You can strangle or choke any target up to one size category larger than yourself. (For example, a Medium-size character can strangle any Large or smaller creature.) When grappling an opponent, you can choose to strangle him instead of damaging him (see Damage Your Opponent on page 154). With a successful opposed grapple check, you prevent the opponent from breathing for 1 round. If you get more than one attack per round, you need to succeed on only one of them to prevent your opponent from breathing. (That is, if you fail one attempt but succeed on a second, the strangle is maintained.) The target can hold his breath for a number of rounds equal to his Constitution score. After that period of time, he must make a DC 10 Constitution check