This cat appears to be attacking half-heartedly imo. Looked like an unneutered male cat looking for a fight, not for a meal, and a play-fight at that, i.e., looking to dominate, not even seriously wound. In my opinion he wasn't hungry, didn't need or want to kill and eat. He could have delivered a kill bite in each attack, well-positioned in all of them for that. It was more an ill-tempered wrestling match for the cat, and a territorial defense by the hens, as in my opinion the chickens have experienced this before, or they would have run and made much more noise, esp after that first attack, the released hen just walks away, and the second hen who gets jumped from behind was cautiously walking and not panicked either. All probably very entertaining to the people there. Sad.