Ki going thge wrong way
I recall the end of a class I once attended, The instructor was demonstration sitting Kokyuho. She explained that to move uke you must extend Ki. She did so and we all heard it.
As Uke in seiza facing her, I had to keep a straight face. She demonstrated a second time, once again we all heard the power of her ki. And one more time, whoops there she goes again!
Three times in a row, this woman certainly had some ki in there