Was there some hint text displayed, when they got down? They also need to recover from suppression (not being shot at for a while) before they start to act normally again. As ArmA doesn't have proper mechanics for detecting hostile bullets and my skills are quite limited, so i needed to use work'around-system which doesn't work perfectly, so it might have been that own fire has caused suppression.
Those mission are just hasty made examples, showing possible advantages/disadvantages suppression can cause. One-on-one squadfight isn't best way to present that, but it shouldn't be too hard to do yourself, just make that mission using quides provided with .ZIP.
There's better and fullfilling thread for this pack in here: http://www.flashpoint1985.com/cgi-bin/ikonboard311/ikonboard.cgi?s=b2904536970581ff8a177179d54687c6;act=ST;f=71;t=61610