OCGA § 17-4-60 - Grounds for arrest
A private person may arrest an offender if the offense is committed in his presence or within his immediate knowledge. If the offense is a felony and the offender is escaping or attempting to escape, a private person may arrest him upon reasonable and probable grounds of suspicion.
That's it. You now have the entire law.
I think, in spite of the early arguments of "who knows what Arbery was doing," which is not reasonable and probable grounds of suspicion of burglary, the facts as they have come out at this time show no grounds for arrest.
This law did not cause the issue. The three criminals who decided for no reason a black man seen there must be a burglar caused the issue.
We do not need to further separate and alienate law enforcement "special status" from the rest of us. That is a mistake.