It doesn't need to cite any sources. This one is simples, COVID mutated to the point where it could travel beyond the speed of light, and travelled specifally to the same period as the Spanish Flu, destroyed and wiped out most of the Spanish Flu virus/germ/bacteria.
Then Covid decided to hibernate until it could return to its original timeline. Why? Because it is the deadliest virus of all time.
It doesn't need to cite any sources. This one is simples, COVID mutated to the point where it could travel beyond the speed of light, and travelled specifally to the same period as the Spanish Flu, destroyed and wiped out most of the Spanish Flu virus/germ/bacteria.
Then Covid decided to hibernate until it could return to its original timeline. Why? Because it is the deadliest virus of all time.