I disagree. I think it sounds reasonable when fearful that an intruder is about to shoot, and he's on his stumps and his bedroom door is locked, preventing quick and certain escape for him and Reeva.
It doesn't matter if he can run on his stumps better than he can walk - it matters whether he was afraid he and Reeva could safely and quickly escape his bedroom (whether on stumps or legs or whatever).
And BTW where is everyone getting this information about how mobile and quick Oscar is on his stumps?
About to shoot
with what and
at what? Apart from the fact OP hadn't even seen an intruder let alone a gun, the intruder/s he thought he heard were in the loo down a passage and inside a bathroom,
not with Reeva and he in the bedroom behind a locked door. (T'would be most ironic if OP were convicted on the evidence of witnesses who heard a woman scream and it had been OP screaming... he would have a lot of time to ponder on the audio mistakes of that night!)
Seriously, I am sure you can see OP had better options before leaving Reeva and rushing armed towards danger on his stumps to pump a loo door full of holes... a bit too quixotic for me! Not only can't I see it as a reasonable response, but neither a wise, safe
nor defensive one either.
What about quietly warning your gf in bed? The one you spoke to shortly before and who could have fallen back to sleep and would be in an extremely vulnerable position. What about giving the gf the opportunity for fight or flight, to chose whether to run downstairs and escape or protect herself with a gun hiding in the locked bedroom while waiting for the police? (Reeva did target practice too so was not a neophyte)
And imo it's worse, according to OP's affi he believed there could be more than one intruder so he couldn't know one wasn't lurking in the passage or bathroom ready to shoot whoever stuck their head out? But of course he thought the intruder/s were in the tiny loo together, not the much more likely scenario of one keeping guard while the other peed... or searched the toilet for valuables! And what if OP had been killed. Where would that have left a sleeping Reeva... dead I suppose, so no change there then!
No, bad jokes apart, what about phoning security, (he paid to live in a 24/7 guarded estate), or in a last instance the police? (Or maybe better in the first instance?) And while waiting whichever's arrival, what about putting on his legs while Reeva aimed a gun at the locked door? And if he dared go down a dark passage on stumps, what about going down the stairs and out... I mean if the intruders had to climb through an upstairs window and they were in the loo it would be reasonable to think that no others had entered the house on the ground floor... ah, but methinks reasonable was not in OP's mind at least not
that night!
Oooops... I almost forgot. Search for YT video "The fastest man on no legs", you can see OP briefly as a kid running around on his stumps, and his mother, OP, and others telling about all the sports he did and how nothing could stop him doing everything other kids did. There is an interview also where he puts his legs on... super quick, but I can't remember where I saw it, and there are many YT videos of double amputees showing how they can walk, skip, run and put on their prosthetics, etc.