Thanks for the help, all.
The milt seems none the worse for missing a leaf (it has recently put
out several new ones, after all) and the two flowers are doing fine.
The plant is in an east facing window with wavy glass in a bathroom,
where it gets plenty of humidity twice or more per day. I don't have
the time or patience to mist my orchids, but I get flowers out of the
mature ones nonetheless.