Easier way to get "Professional" Trophy/Acheivement
First off you can do it without the knife, this way you don't have to be detected by the investigating henchman. Start off by looking at the two guys on the right, shoot them with one bullet. Do the same with the middle pair. Then if you look to your left this pair dosnt let you get a good two kill shot right?
Wrong! The rightmost gaurd of the left pair moves around. Wait untill his leg is lined up w/ the one on the right and shoot. Then it's easy to kill the investigating gaurd and his dog with the two remaining bullets. This way you don't have to hassle with the knife.
Hope this helps.
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