I wish I could mate, but I'm no longer on the tools anymore. I'm now a fookin desk boy programming and project engineering all the machines and any prototypes that come in to the work. Really seriously miss working on the machines.
I personally thought the chain guard was there to prevent things flying off the chain (grease/ dirt) and to somewhat prevent lose/dangly things from getting tangled in the chain. As for stopping a thick heavy chain spinning at crazy speeds from flinging up and ripping someones leg off...i'm pretty sure it wont do a thing. I have seen engine cases with massive cracks in them from snapped chains that got lodge near the front sprocket.
Very few chainguards will prevent damage by the chain if it breaks. They are mostly there to stop you getting fingers or toes in there. The swingarm brace does a good enough job usually.
