That’s a shame. I have had two rabbits get trapped in my garage overnight that died from fright. Little buggers just can’t take it.
I’ve read that rabbits do drop dead if frightened. Little guys are so vulnerable to everything it’s a wonder that rabbits aren’t extinct. They come into this world helpless and are in a hole that every cat within 5 miles seems to find. If they make it through that, they still have cats to contend with until they become full size. After that well...it’s the heart thing.