Having thought about it, Wallace did the right thing. If he fought back, it would look like Clinton was only fighting fire with fire. Instead, Wallace looks like he's just sitting there, while Clinton looses it.
Exactly. Wallace was obviously stunned and did the best he could under the circumstances. . You simply don't expect a former President to act that way.
Also, I'm not sure how physically large Wallace is, but Clinton is a BIG guy, and I have no doubt he knows how to make his presence intimidating.