I think if you are tough enough and the person beating you is not especially strong or in shape it would be possible to simply outlast their beating as long as you protect vitals like your head and have a strong enough tolerance for pain. The guard doesn't seem to have displayed the strength to break bones with his swings so the damage he's inflicting, while likely quite painful in the short term, wouldn't necessarily be debilitating once he got tired of swinging and gave up.

It was good to see Baremoto realizing he was a part of the crew as well but I can only wonder what the next trial the gang will be put through will be.