Wow Knotted - riptides are not good places to be. Glad you got out of that one alive. I've had some close calls myself but looking back nothing too bad though for a little luck could have gone very wrong very fast. But when you dive a lot, and I was a mate on a dive boat for several years, I've seen a lot of bad stuff go down, and been through 4-5 chopper evacuations. You really don't wanna go there. Enjoy your snorkeling and live to tell your grandchildren about it.