> mixing still-too-cold blood from your extremities with the core blood and dropping your core temperature suddenly and fatally. Unlikely. there will be very l

> mixing still-too-cold blood from your extremities with the core blood and dropping your core temperature suddenly and fatally. Unlikely. there will be very little of that cold blood to mix. Very little. Adding heat will cause your core temperature rise. What is more likely to happen is that the sudden vasodilation drops your blood pressure, and your heart, possibly still in it's stunned cold state, can't compensate with stroke rate or variability. Then you risk cerebral hypoperfusion in the face of increasing metabolic demand (warm cells run faster, burn more glucose, need more oxygen to burn that glucose)