Thanks for sharing the video with an appropriate title!. I guess the way the hexacopter slowly started sinking when it ‘landed’ is abit how any of us feel when thier multi rotor has a forceful meeting with the floor .
As for the motor with the strange noise when you first connected it, does it still make that sound or was it a once off? It could of been a little stuck initially and made that noise so should still be fine.
For the motor that is abit jumpy, that is just the magnets passing, that could be due to it being knocked abit off alignment causing some magnets to be slightly closer than other motors. Usually this is fine, but best to run the motors with your hexa on the ground to see if they are all running ok (and none getting particularly hot), you can do with by flipping the props to press down rather than lifting.
My advice would be to also double check all the connections as sometimes in a crash the bullet connectors can come loose which can cause major crashes when a motor suddenly stops. If there is something else weird with a motor like a faulty bearing it will fail slowly so you will have time to react and get it to the ground safely. But after a few minutes of ground testing you should have a decent idea if things are ok or not.
Hope that helps and that you get flying again soon!