Why we do form training so much?
This is because this is one way to train ourselves to be familiar with our own movements.
In the beginning of the clip my student is attempting to apply a technique but his movement is not filled with confidence hence the uncertain feel I was getting.
When you know the movement really well you can move so much better. It is not unusual for a student to think that a lacklustre technique is acceptable. It might be when he is training with another student but it will not be if he is doing it with someone at a higher level.
When you know your movement it is like a highly tuned and sensitive instrument, so much so that a slight deviation will set off an instant response.
Otherwise, you can run round and round in circles and still cannot find the opening for your attack.