Yesterday Mr 5mil Capper was splitting the bids up as well so it's possible he/she is already spread across a few pips to increase the depth. Mr 5mil Capper could also try a nice short.
It is also possible that Mr 5mil is now a Mr 10mil but that remains to be seen.
Hold onto your shares is all I can say.
As always trade in your own risk appetite and only risk what you can afford to loose.