Uh no. Moderators should not be sucker punching anyone. They should he as invisible as possible. These so-called debates are devolving into communist show trials.
Communist show trials proceed without any testimony from the accused, except for tearful, cowering confessions, typically obtained by a combo of torture and threats to massacre family and friends. Those who don't confess are simply shot without the formality of a show trial.
Debates are nothing like show trials. They are job interviews conducted before a live audience so voters can find out how candidates respond under pressure that's a tiny fraction of what presidents encounter once in office. What we've learned about the Donald is that when under pressure, he'll conduct a wounded veteran's benefit. That makes him qualified perhaps to head up the VA. The White House is a giant leap.