“The use, attempt, or offer to use force upon or toward the person of another is not unlawful in the following cases: (2) Whenever necessarily used by a person arresting one who has committed a felony and delivering him or her to a public officer competent to receive him or her into custody.”

They should really define the word 'force'. There's a big difference between breaking someones arm and blowing their brains all over the dash board.

My interpretation is that the law is referring to 'non-lethal' force, simply because at the end it says deliver them into custody, not a morgue.