I've been training at an MMA gym in boxing, BJJ, and at a separate gym in krav maga for the past several years so I know I could have easily put this guy down but then what?
No, you don't know that you could have put him down.
You don't know if he was armed.
You don't know if he is also trained.
You don't know if he is on powerful drugs.
You don't know if he was armed and trained and on powerful drugs!
Imagine what it would be like if your krav maga instructor was armed with a knife and on PCP and hell bent on killing you.