I would say that is reasonable and not excessive. There is a spectrum of force that can be applied in any situation, from restraining someone, to pushing them, to striking them, to using a blunt instrument, to using an edged weapon, to using a distance weapon like a bow or a firearm. The likelihood of lethality increases along the spectrum.
In my mind it would likely be deemed excessive to meet non-lethal force with likely lethal force. You don't shoot someone for shoving you. If someone comes at you (or anyone else) with a machete (a likely lethal means), then that threat can be REASONABLY countered with the minimum available means that is likely to stop the threat.
I wouldn't get into a sword fight with another swordsman of equal skill. I would shoot him. But it might be seen as unreasonable to mag dump into him.
I recall a lesson on vehicle checkpoints and rules of engagement. If a vehicle tried to crash through the barrier, you weren't allowed to open fire. But if you or another soldier were standing in the way, then the car and driver became a lethal threat, to be countered with lots of bullets.
All just my P.O.V. Not to be treated as legal advice.
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