Tai chi chuan/baguazhang application

Successful application requires the student to adhere to the taijiquan guidelines.
There are 3 main considerations:

1. Lead into emptiness
2. Use no more than 4 ounces of pressure
3. Borrow the opponent's force

If you force a result, then it is external, like judo.

You can tell when yielding/shuai jiao is used appropriately because the attacker simply seemed to fall.
Very little effort was necessary.
There was no fighting and no struggle.