Fans always want the fight to continue.
You forget that just one punch from these guys does damage in some way or another.
These are guys on the top level who train to do nothing but land hard punches over and over. And if your the guy taking those shots, eventually it needs to be stopped. Yiu cam lose your entire career, your health, and your future well being in one fight like this.
And we all know steve smoger wasn't going to stop that fight.