2.5 gravities surrounded An as he moved quickly towards the man he had knocked away.  Every step he took was one where he observed what would happen to Johnny based on the sudden reversal of gravity. The effects of gravity on the intracranial and cardiovascular system must be taken into account whenever a change in the hemodynamic flow occurs. To be certain many humans have entered space from an earth-normal gravity to weightlessness, as well as fighter pilots pulling extreme g-maneuvers whilst in combat.  These people had one thing that Johnny didn’t have, pressurized suits to help continue a regular and normal flow of blood to all vital organs, and Johnny had an extreme change in gravity which would affect his hemodynamic flow. 

Thus far, Johnny had proven to be unbeatable, resisting the effects of gravity, managing to fight with skill even when weighing in at three times his normal weight with strength that An would not have believed a 166lb. man possessed. That was in the past. Now science would do to Johnny what An’s fist had been unable to do, it would stop Johnny. No if’s, no but’s, it simply would. While Johnny had been fighting under the stress of three-gravities, it was taking a physiological toll on his body, conforming to the strain of the increased weight. Each move Johnny did, every dodge, every stomp, every action simply added to the event that would either kill him or place him into unconsciousness. Science was unforgiving that way.

Under the strain of even normal gravity, blood tends to pool at the feet, requiring the heart to pull the blood up through it, to circulate through the body filling organs and the brain with the precious fluid. Under three gravities the heart had to work three times as hard, each beat drawing blood as best as it could to send it where needed. Johnny’s heart had to work under such a strain without the aid of a pressurized suit. Johnny’s heart struggled to allow him to move, and to react by keeping as constant a hemodynamic flow as possible. To draw the blood that pooled at his feet and lower legs.

With the immediate shift from three-gravities to zero gravity, there would be sudden changes in fluid pressure due to the shift in gravity. This fluid shift would affect Johnny’s intracranial pressure, his cerebral hemodynamics, his vision as well as the heart’s ability to regulate his blood pressure. Most kids know that when they are on a tilt-whirl they spin at three-gravities, pressed against the padded backing laughing, struggling not to vomit and excitedly looking for the minute they can step from their standing chair.  When these kids finally do step away the blood that pooled at their feet goes rushing up and into their brains, in some cases causing them to get headaches, experience sever dizziness or even faint. Do these effects happen to all? To some degree they do. Most people feel a few moments of unsteadiness then recover as their body is quickly adjusting to their normal weight. Not a problem as the effects usually last no more than a minute.

However, the increased intracranial pressure Johnny would experience occurred because of an excess amount of fluid, in this case blood.  The change from three gravities to zero would shoot the blood from his legs up and through his heart. Of course the heart would attempt to regulate the pressure, but since it had been under such high pressure, the heart would not be able to regulate the flow. It was this sudden rush of blood, that would be Johnny’s enemy as any strained arteries might rupture, causing him to bleed internally. Or worse rupture in the brain as the increase of fluid flooded his head, perhaps causing an aneurysm.   As the pressure of the fluid increases, the ventricles enlarge and Johnny’s brain would press against his skull, damaging the brain tissue as well as affecting other organs that perform important functions. Like the ear canal which provides equilibrium, and the optic nerves which provided sight to Johnny. More importantly, the sudden increase of fluid in his skull would give Johnny that dizziness and unless he managed to pressurize himself, which seemed highly unlikely, as he had not done so previously, would render him unconscious. 

That would be all An needed, once Johnny went out, he would simply break his neck. Quick, efficient and painless, at least An hoped it would go that way. Of course knowing how Johnny managed to escape the effects of prior gravitational effects, An wasn’t going to hold his breath until he heard the slight pop of the skull being removed from the spinal column.