Why did Secret Service tackle VP Vance before Trump during the incident?

Why did Secret Service tackle VP Vance before Trump during the incident?

Because VP Vance could move better and Trump face planted himself

Because Trump has Dementia and Vance doesn't
Because Trump just isn't in good physical shape
Because Trump would be harder to move
Vance is just faster than trump
I don't know
I know why as stated below
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Why did Secret Service tackle VP Vance before Trump during the incident?
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