Acamas,
well I see AMEVSCAP'S holding as a strategic one, bought at a good price before production commences, and one which would become vital if a takeover bid was to occur IMO.
I see AMEVSCAP as being in a win win here, either the SP will rise due to production and further exploration, or because SEY become a bid target. For this reason, I doubt they will sell into any rise.
As they have accumulated around this price, providing there are no problems with production startup, there seems a very limited possible downside for them, and potential for a 50% - 100% upside within the next year, IMO.