Are You completely sure that A65 is not injured? If so, then you can end the game if B agrees with the 10 seconds substraction (it's quite sure B will agree) but, in any other case you can't go with the 10 seconds.
In my case I would not substract the 10 seconds. The player A65 will go out for the next down because the clock was stopped due the injury. I am not a doctor, I am an official, so I can not know really if the A player was injured or not.