Now that forearm strike is real. I was at a knife fighting seminar sometime back. The instructor said it was the fantasy time part of the class. That being disarming an armed opponent. He called it fantast time because he would never suggest that anyone ever try it.
One of our guys, nicknamed Tank, came at the instructor with the knife. Instructor grabbed the wrist and applied that forearm strike. As the instructor was walking away the guys noticed that Tank was weaving back and forth ready to go down. The instructor said to rub the big knot down that had formed on Tank's forearm, because if we didn't, he would be out for a while. That part was really cool.