@Override
	public boolean okMessage(final Environmental myHost, final CMMsg msg)
	{
		if((sprung)
		&&(affected!=null)
		&&(!disabled())
		&&(tickDown>=0))
		{
			if(((msg.targetMinor()==CMMsg.TYP_LEAVE)
				||(msg.targetMinor()==CMMsg.TYP_ENTER)
				||(msg.targetMinor()==CMMsg.TYP_FLEE))
			   &&(msg.amITarget(affected)))
			{
				msg.source().tell(_("The cave-in prevents entry or exit from here."));
				return false;
			}
		}
		return super.okMessage(myHost,msg);
	}