In those cases, the spread between the bid & ask goes to the market maker as compensation for making a market in a stock. For a liquid stock that is easy for the market maker to turn around and buy/sell to somebody else, the spread is small (narrow).
In cerebral hypoxia, sometimes only the oxygen supply is interrupted. Brain cells are extremely sensitive to a lack of oxygen. Some brain cells start dying less than 5 minutes after their oxygen supply disappears. As a result, brain hypoxia can rapidly cause severe brain damage or death.
Time to Freeze Solid Phase Change (4.62 + 5.97)= 10.59 Hours. If you were initially alive your metabolic heat and added work burning calories would stretch this out a couple of hours before hypothermia set in. After you die then it would take 10.59 hours.