You need to understand the basic concepts, tactics, of ving tsun fighting, then it becomes clear.
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The same question can be asked, "What's the purpose of a throwing dummy?"
http://www.karatedepot.com/bx-sb-138...FSg1gwodmi5aQg
The answer is, "When you don't have training partner, that throwing dummp will be the only thing that can help you to develop your throw."
here is a clip of what I would consider some good techniques...
CLIP
Actually I believe in punching your face to establish a bridge...When you parry, cover or attempt to strike back a bridge is formed. From the bridge you control your opponents center so you can strike and kick him with out him being able to strike you back as much. Pull him off balance, flank him, blind side him, turn his attack line away from your center. All the while you continuously punch his nose and chop his throat!