Accidental shift into reverse without clutch

I woke up on the wrong side of bed this morning. When I went to back
the car out of the parking spot, I didn't clutch and tried shifting it,
accidentally. It shifted by making a grinding noise and stalled the
engine.

Once I tried reversing with the clutch, it moved and everything seems
to be working. I am curious to assess the damage I did.
Hope to hear some expert opinions. Thanks