The gambling community were initally nervous of Nora's ex arriving. She very quickly went from odds-on fave to go to level pegging with Marcus (as people people must have been hedging quickly based on the thought this might save her with voters keeping her in to see what happens)
BUT - the backlash at Endemol has kicked in already. The live trading on Betfair, for example, means the odds have rebounded even beyond where they were before (Nora was 1.86 fave before, currently 1.58).
Before they suspended for the evening, the bookies were also moving her back to their previous odds as weak odds-on fave.
Essentially the conclusion is that her ex going-in is actually going to be the final nail in the coffin for Nora