An Interview with Park Ranger Chris Carroll by Park Ranger Patrick Gamman. After returning to Phantom Ranch for the first time in 40 years to do interpretive programs, Ranger Chris Carroll describes his first canyon hike. What started as an adventure - ended in a bout with dysentery and severe dehydration. Carroll tells how he met a "knight in shining armor" who stuck with him for more than 7 hours and enabled him to rehydrate, recharge, and to walk back out of the canyon. Let's examine some of the differences between Grand Canyon backpacking, "then and now." Today, we have ultra-light sleeping bags and really great shoes, but there are still many factors that can get you.