Is there something wrong with this sentence? 暑いから水を飲みました。


I was watching [this
video](https://www.youtube.com/watch?v=G3_-LuElzfA&index=7&list=PLINFE8v4DOhsq0scG83kB5CRnowYWGSH7)
explaining から. In it (at :08 and again at 2:29), the instructor shows a scene
where he is drinking water, and says ”暑いから水を飲みました。”, then a buzzer noise and a
big red X shows up. He then goes on to a scene where he is taking off his
shirt and says, ”暑いから脱｛ぬ｝ぎました”. This sentence gets a ding and a green circle.
He doesn't explain this, so I can't tell if he is making some kind of joke
(perhaps about his preference for getting nude vs drinking water in response
to hot weather), or if he is saying the first sentence is wrong for some
reason. Is it? Why?

Note that I would have asked in a comment on the video, but someone already
did that 6 months ago and hasn't gotten a response from the author of the
video.




I think 暑いから水を飲みました is natural.




I think 暑いから水を飲みました is natural.

