Never say never, but it would be very rare for a fleeing person to pose immediate threat. Examples would be people running for a gun, running to get help, running to kill someone else, or running for cover.

I think all of those cases are covered by any imminent threat clause, and thus do not need special exemptions. Just like there isn't an exemption that you are not allowed to shoot a retreating person. It simply follows because (with exceptions) retreating people aren't imminent threats.

It gets much harder to argue, but you'd have a case if they were, for example, running back to their car to get weapons. I'm sure you can think of a hundred other scenarios as well.

That isn't normal, though. It's likely that you were already feuding, and so the law will look askance at you for not bringing authorities into it much earlier.

What if they have stolen your property. Do you not have the right to get it back by force? Does the value of the property matter? If so, who gets to decide that in the moment?

what if they stole your laptop that contains a new branch you havent pushed to a remote yet.