I was standing I think. My eyes were closed, and I was constantly doing the nose pinch RC. It kept half failing but half working, like some air would escape but most of it would stay in my nostrils. Very odd.
Yeah, this can happen sometimes and your RCs can fail. Its always a very good idea to have a back-up RC or two for this very situation. The nose pinch is the most reliable to me, but even it can fail or half fail every now and then.