Forget;
I was thinking of the counterbalance, and/or that the elevater may have hit something itself, maybe the detaching undercarriage, although it doesn't look like it from the image. It all depends on how hard the impact was of course.
You may be right. The other end of the elevator seems to have come away slightly at the hinge line. Loss of control linkeage/cable leading to flutter? I can't see a lightning strike primarily causing structural damage like that. It does look to me like a torsional failure; aerodynamic load on surface against counter-weight momentum?
Please excuse the blatant speculation here, such incidents as this arouse an insatiable curiosity in me.
The most interesting aspect of course is how a lightning strike led to loss of elevater control. I'm assuming it is a direct linkeage system (cables/rods/bellcranks as opposed to hydraulic or electrical). I had always thought that such systems were isolated against this.
Good news on the injury prognosis.