As a last resort, probably. Calming down a raging horse that went mad out of nowhere and you don't know what is the cause, putting it down was the only option at the time. In cases like these, its either risk a maneuver to calm her down and risk the high chance of it not working or kill her
Understandable, but that was their first resort, no one even tried anything else. It's not a big deal, but damn
Because, as I said, risk the chance of anything else not working. With a horse going mad, you don't get second chances to try and calm and horse down. You will be the first to hurt before the horse could calm down. And this situation called for Bella to be unfortunately and unnecessarily killed not because of Knight’s actions but the red headed bitch.
Did he have to kill the horse...