The correct answer to both scenarios is the same:
First, know your state's laws.
Second, were you in fear for you life or serious bodily harm or someone else's. If the answer is yes, lethal force is justified (in most states).
ALways call 911 first. But in both scenarios (given the beating continuing in the first one) I believe it is clear that the answer is yes.
In the first scenario your best response would be to call 911, report the location of the incident, description of the assailant, victim and yourself. Tell the 911 operator that you are armed and that you're certain that if you don't stop him, he will beat the other guy to death. Holler at the assailant, telling him to "stop you're killing him, if you don't stop I will be forced to defend his life" (remember 911 calls are recorded). If the beating continues, shoot until the threat is removed. If the assailant complies, don't shoot. If he runs, don't chase. If he stays, order him to lie down and wait for the police. Make sure you give the dispatcher your description including what you are armed with so the responding officers will know who is who. When the officers arrive, don't move, listen to and closely follow their commands.
In the second scenario, call 911, give the dispatcher the same information as above. Walk up to the dog and if he doesn't turn his attention to you, position yourself so you can shoot him in the head from above without hitting anyone else. Shoot. If you can't get a clear head shot, shoot c.o.m. from above (remember your safety rules: Know your target and what's beyond).
In general, if you or someone else is in fear of death or serious bodily injury, lethal force is justified. But, you need to know the specifics of your state's laws.
First, know your state's laws.
Second, were you in fear for you life or serious bodily harm or someone else's. If the answer is yes, lethal force is justified (in most states).
ALways call 911 first. But in both scenarios (given the beating continuing in the first one) I believe it is clear that the answer is yes.
In the first scenario your best response would be to call 911, report the location of the incident, description of the assailant, victim and yourself. Tell the 911 operator that you are armed and that you're certain that if you don't stop him, he will beat the other guy to death. Holler at the assailant, telling him to "stop you're killing him, if you don't stop I will be forced to defend his life" (remember 911 calls are recorded). If the beating continues, shoot until the threat is removed. If the assailant complies, don't shoot. If he runs, don't chase. If he stays, order him to lie down and wait for the police. Make sure you give the dispatcher your description including what you are armed with so the responding officers will know who is who. When the officers arrive, don't move, listen to and closely follow their commands.
In the second scenario, call 911, give the dispatcher the same information as above. Walk up to the dog and if he doesn't turn his attention to you, position yourself so you can shoot him in the head from above without hitting anyone else. Shoot. If you can't get a clear head shot, shoot c.o.m. from above (remember your safety rules: Know your target and what's beyond).
In general, if you or someone else is in fear of death or serious bodily injury, lethal force is justified. But, you need to know the specifics of your state's laws.