From MC's perspective:
Elder Galvin is taking me to the Adamont Canyon. His speed was so fast. I can only see flashes before me. If this goes on, I think we will soon reach the location.
Meanwhile,
The Dark League has arranged people in Adamont Canyon. After some long discussion, everyone decided to use this Adamont Canyon to Kill Vincent Carey.
To make it believable, they didn't even forget to use a law fragment inside a secret base. This time the high-level figures didn't come personally.
As their movements are watched by many. They can't casually appear outside. If one of them appears near Adamont Canyon. It might alert the powerhouse of the Yellow River Academy.
They know that the Sub-Taboo Hall Powerhouse appeared last time to protect Vincent. So they don't want the same thing to happen again.