Who is able to trade during that volume auction?
Presumably they open again and if another 10% move happens, they are locked up again. This is different to the US circuit breakers where the stock shuts down for the entire day?
It's not really a circuit breaker if it's only for 5mins though?
and if all market participants can enter trades still, what is the main point of the auction as it doesn;t seem like it's stopping trading?