"Be quick and strong and bigger and faster and more willing to be a sociopath in the fight and you will beat the best martial artist in the world who isn't these things.
I once had a woman karate expert admit to a group of women that fighting me would result in her being maimed. They were crushed... they somehow believed that a few tricks could turn a 100 lb woman into a formidable adversary for a 180 lb ex boxer biker with a mean streak."
You must mean a lot bigger, and the martial arts person is usually...faster, - don't mix faster with first.
As for the weight difference, 100 lbs woman is on the verge of starving, while a 180 lbs man, all due respect, is not a big bull. (I'm somewhat slim, and yet 190). The difference in size is more normally like.....130 to 180.
Well, anyway, guys are normally much stronger, so this is another issue, - but a guy vs a woman is normally something of nuts, mugging, rape attempt, or home violence. In all cases, some studies of martial arts cannot be anything but good for the woman.
Now the finger trick might work on somebody not too serious, but you must know that there are many more meaner things to do. Even a woman of 100 lbs may be able to stun a 200 lbs guy and get away. Even stun you and grab your gun