If you clash / bang uke's arm when doing this, it is because you are too late.
Nah. It's because that's how we do it (Yokomen Uchi Shihonage Ni, in this case). We bang his arm while it's still unwinding the strike and we bash his face with the high hand if he doesn't block strongly enough. It's my intention to break his intention, even if I don't need to. No Ai this time.