I think I figured it out the first time I saw it (but only because his voice sounds recorded during the last bit of the fight on the bridge)...there's a point during the fight where the actor playing the beast goes through a door out onto the bridge and from then on, the double plays the beast in the fight and then when you see him float into the air, that's actually the real beast with a mask and gloves that can be easily removed.
"I don't really get the ending,all i can go with is when after several months,Judith saw Pat sang,and later she kissed him on the toilet,after that the story back to where Pat went down from the stage after he'd sung,and he went to the italian lady.I just don't get it,what Judith exatcly meant when he kissed Pat that she had seen,and did Pat end up together with The Italian Lady?Please help me,thank u very much!"
Quote from someone on IMDB in reference to a movie he/she didn't understand. Such grammar!