Answer:
Oxygen deprivation to the brain
Explanation:
The brain is regarded as the most important part of the body, because its activity controls all other parts. It is known to be the part the make use of the highest amount of oxygen in the body , this is because of its many activities.
It should be understood that , whenever there is oxygen deprivation to the brain, all other parts will be affected. This is because, as said earlier , it is that part that controls all other parts in the body.
It should be noted also, that the damage caused to the brain will depend on the extent of the oxygen deprivation. And some people can recover with little or no consequence, while in some it may be fatal.
In this case, Marcus was seen another which was different from what he supposed to be seen because his brain was shutting down due to oxygen deprivation, and would have been fatal or resulted to death if he has not been rescued.