Well.... if it were my stuff and provided the bars are not bent and the lever was only moved a little with no real damage I'd take it as a sign that the bars, controls and stem are just fine. If the bars are carbon that would be another issue. Carbon can have internal delaminations that can show up later despite not seeming to have any external damage or deformation. But if they are alloy then no bend = no damage. If carbon then they'd go in the dump.

And if the bars didn't bend at all then I can't see the stem receiving enough force to be an issue. Especially since it's a THompson and is made from excellent quality alloy.

But of course you're not me and I haven't seen the actual damage. I'm just saying what I'd look at, evaluate and decide if I didn't see any bends in the bars and assuming that no carbon fiber parts are involved.