Rio 1985 / I Want To Break Free incident

I'm concerning about what was exactly happened at 1st night.

Abstracting from "hot" stories in the press, I believe something had happened, because of two facts:
1) Fred at 42:17 shouts "Stop it!" and something else onwards (http://www.youtube.com/watch?v=ivdR8jSFeuc)
2) On the next show he didn't wear boobs and wig at all.

If it had been something like negative reaction to the presentation of the song, then performing the joke with the boobs at the end of the song along with Fred's good mood is unexplainable (clearly seen at 43:12).

If it had been a local fight in first rows or something like that, then what was the reason for the 2nd fact mentioned above.

Any thoughts on this one?

He yelled "Stop it!" because the audience were upset with the gag, and they threw stuff at Freddie.
As for him not wearing it during the 2nd night, go figure ;)

there must have been an argument over freddie's boob gag and started to throw a stone at him

How to explain Fred's mood at the end of the song as I told before? Was this good smiling face only a masking to hide the frustration?

http://www.youtube.com/watch?v=ivdR8jSFeuc

He also says during Jailhouse Rock-

''-Everybody! Hey! (...) Come On! No fighting!! Rock 'n Roll!'Music, Music!''

You can see the fight very clearly at 44:21 and 44:10