But now, he fully understood!
"[Only after the Millennium Stakes are driven, can history be locked, using Forced Evasion to protect the established history from being altered by Space-Time Travelers! This action to maintain the stability of the world line, and even directly locking the world line... is called History Lock.]"
"So to speak, even if one uses ordinary Space-Time Particles to travel back to the present time of 1952, it is the same as the Entangled State of Time-Space Particles, it wouldn't trigger Forced Evasion, not constrained by the Space-time Law, thus allowing history and the timeline to be altered, until... the first Millennium Stake is driven in."
He took a deep breath.
How ingenious.
So... it really was just like he had suspected before, everything started because of the Millennium Stakes! The Millennium Stake is the beginning of it all!
Then.
In 1952, this first stake nailed into the river of time, locking history, on what day was it driven in?
