It is always like that one if you watch UFC or similar.
When the opponent lied down liao, the person threw 2 punches only before the referee stopped him. It is very common leh. This one 2 punches nia, if you watched other matches is a few more attacks. Men and women matches the same.
There ish no time to think if opponent is okay or not, should I just stop when opponent lie down, etc. Their job is to bring themselves to a win. So presence and job of referee ish very important.
As for necessary or not, I wouldn’t comment much as I don’t work in this line and I’m not him.