By definition, a kid will not awake easily during a night terror and will not remember having one.
If you grab, hold, shake etc. You will likely scare them if they wake. Most nt are brief, lasting 5+/- min & the kid settles, awakes later refreshed with no recollection of the event. If you waken them, you will confuse them & must explain why you woke them to a kid who doesn't understand why.