Question: Does being in Samadhi correspond with a totally breathless state?
There will be minimal breathing. If there is no breathing, then the body will perish. These things like changes in breathing occur automatically, if you focus the mind then the breathing energy becomes channelized. Also when one is in deep Samadhi, when one comes back to the waking state, then it is good to take a little water. Going into Samadhi is one skill, then coming back to the level of the brain is a different skill. Taking water makes this a gentler transition.