Quote from sprstpd:
As I said before, there are only two options here. One is that you close out the position immediately and then contact IB. The other is to not touch the position at all and then contact IB. But putting out limit orders at advantageous prices right before a news event is not an option unless you want to look like you are trying to trade the position as a "no-risk" position.
By the way, this situation is very similar to some that I've been through in the past involving positions that I took in afterhours trading during earnings announcements. I would get into a position at what I thought would be a very good price, but I wasn't 100% sure. But as it turns out my fill price was in the "bustable" range of afterhours trading. So the counterparty could be filing for a bust of the trade, while the earnings trading is going on. Do I get out of my position? If I do, and the counterparty does get a successful bust, then I probably lose money. If I wait, there is a chance that the position goes against me. Anyway, the reason why it is similar is because the counterparty could be trying a "no-risk" trade in that if the position goes for him after his fill, he wins. If it doesn't, he tries to bust the trade and if he gets the bust, its no skin off his back. This has happened multiple times to me, and in some cases the bust was allowed and some cases it wasn't.
The possible bust is similar to this case. What will you do if you get a bustable trade?
Close it. If that trader bust that trade, you lose.
Leave it open. If that trader doesn't burst that trade, the market may goes against you, you lose.
What will you do?
PS: By the way, I think you need to pay for bust fees so it isn't really "risk-free".