Thats why I said he didnt lack courage.
He kept on getting up and having another go.
Watch it again, look at the continual head back and up, body leaning back, arms flailing uselessly.
(I couldn't box for shit, wasn't really interested in learning boxing, but I had to learn how to scrap due to 70's boarding school.)
He is probably very good military material ; not sure he can do vicious when required.
It was probably his first time ever milling. Its similar when most people box for the first time, loads of defence and backing away. Once you get used to it, its becomes easier.