Currently, if the hero already has a scheduled move when a message box is displayed, it continues its path when the message box is closed.
The expression "StopHeroMove" remedies this.
Causes the hero to stop moving on the adventure map.
Example of use:
MessageBox("Beware! The swamps are filled with hungry creatures roaming around. Watch your steps and stick to the road.");
The hero stops moving after the message box is closed.