Well if you've got it in your head that it's "abuse" then the argument is lost. But if he was trying to make the dog let go with it's teeth by sweeping the dogs legs from underneath him (which looked like what he was doing to me) than that's different. Probably not a good training technique but certainly not the abusive sadist everyone is making him out to be.
You have got to be kidding! What has this whole thread been about??? There are an awful lot of people for whom this is an issue of abuse of this dog - working or not. Now, according to you, he wasn’t kicking the dog - he was merely “sweeping the legs from underneath him”. That’s fine. However you want to rationalize this behavior to make it ok in your mind....