confront the guards and ask "why they hadn't done anything"
Don't security guards etc in South Africa tend to be armed? It could have ended so differently, and no great loss to the world!
Eons ago when I worked at DEC I was in on a Saturday and needed to get console acces to a VAX, but there were no Operations staff in at the weekend, so lifted a floor tile outside the Computer room, wriggled under the partition wall, pushed up another tile, did my thing and left the way I came - nobody ever found out :-D