some ideas I have is to put the playing in a situation such as say a lift and explain a basic counter the whole extend pecs raise arms deal how ever have them need to adapt it or have them in a move where they need to finish off a kick sorta like the first one but in lie aikido or judo and the challenge uke as I mentioned doesn't really help as it does the opener but the just stops this makes him easy to beat if you have even the slightest knowledge of aikido