I also have some higher-res photos here, taken with a real digital camera :)
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walk up to himclamly and then just shout with no waring just shout at him see iof he jumps
Interesting fact: If a guard faints and falls forwards, you can tell that he was properly standing to attention. If, however, he falls backwards, you can tell that he was slouching. The things you learn in Anatomy lectures :)
SOMETHING TO DO WITH LOCKING OF KNEES ISNT IT? (sorry caps lock)
More to do with the muscles involved in standing straight and slouching as I remember, but knee locking also sound feasible.
(P) what's this?