Local memory
A liquidity pool does not wake up because a distant exchange moved. Until someone trades against it, its ratio can remain behind the broader market.
Depth changes the vote
A tiny pool can display a dramatic price and still contribute little to a useful consensus. The oracle weights the places where a realistic size can trade.
The gap closes
Searchers buy from the cheaper pool and sell to the richer one. Their own transactions push both prices back toward agreement.
This article describes a simulation and is not financial advice.