I am a diamond 1 euw player that has watched many coaching sessions and all types of players, koreans, chinese etc, and has very good game knowledge.
The coaching goes like this, we enter a skype call together and the customer shares their skype screen, and he plays live whilst i am in the call with him, advising him and then we replay the vod of the game.
OR we can just go over a game that the customer has played.