[ The human body holds approximately five liters of blood. Losing 20% of total blood volume leaves a person perfectly alert with a steady pulse and an elevated heart rate which, unfortunately, speeds up the blood loss. At 30% blood loss, the pulse is weakened, blood pressure decreasing and the respiratory rate sinking to 30 breaths per minute and falling fast.
Reid is quickly approaching the 40% mark. Heartrate of 120 bpm, fast and shallow breath, fingers trembling weakly as they catch in her clothes before just falling to his side. Nearly gone. Only barely holding on to consciousness. ]