I think you have to be worried about their security for various reasons. It's possible that if things get worse in Hong Kong, the violence could increase and you could have some very serious violence as you did in Beijing in 1989.
More likely, however, is that your people in Hong Kong will have to be much more discreet, not only in what they say in public but even in their business activities. They have to be very careful and they could get bounced out of there by the Hong Kong government—not prosecuting them, but just ending their right to stay there and right to return to Hong Kong.