I'm just looking for guidance with regards to the instruction of the free flowing reg, it was shown to me as follows; remove reg completely from mouth, open the mouth piece with both thumbs while depressing the purge, move reg back towards the mouth and sip carefully, repeat this process. My concern is that in a real emergency this occupies both hands and makes a controlled acent very difficult. I am familiar with the " keep the reg in the mouth, allow excess gas to expell by not forming a complete seal and tilt the head method. Thanks for the clarification.