Per police statistics...that was what I'm getting at ...it's hard to refer to them for other world situations. Again...you have to cuff them sooner of later...thus alot of the time it may END up grounded, and thus be reported that way. It's almost impossible to handcuff a resistent subject standing up- also in a lot of places..theres snow and Ice for 4-5 months of the year...its also likely to go to the ground- desired or not. Of course I agree that they almost exclusively begin standing....but theres a good/reliable chance its hitting the ground at some point. You'll either knock him down...pull him to the ground, or stumble over a fence, curb, bush, uneven ground ect. Even if it's the last stage of the confrontation..it's still ground fighting. Thus In my opinion..you better know both- well, and you better train to get back up fast.