Unless you are training a very specific application against a particular type of attack, it is unacceptable to request certain kinds of attack i.e. a right straight punch.
You must learn to deal with whatever comes your way.
What comes out comes out.
The defender may be aiming to apply shuai jiao, chin na or jing.
But the attacker has no rules, no restrictions.
They must simply attack with vigour and meaning.