Yes, that was also my version when I wrote about positions of the audience mics at the professional recordings (different from the audience tape location).
Nevertheless, what was the reason for the audience sound in that point of song really?
Someone very close to Freddie once told me that those booing were a number of Freddie's ex-lovers who were all pissed that they weren't the "love of his life". He also told me he had a bridge he could sell me.
It's just audible playful audience participation - like the 'BRIAN BRIAN BRIAN' on the other source you have linked. They are joking around during the 'tricky bit' with a sense of 'will he make it' joviality like a tightrope walker or something. A sign of high spirits from the excitable audience. It's a very British thing I think and probably doesn't translate well!
I think there is a similar murmur on Live Killers but i'll have to double check that.