The "X Factor" UK 2015 (series 12) Six Chair Challenge 2 is over, with Nick Grimshaw's 16 boys hitting the stage but the show did not end without controversy.

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It took a shocking turn when Mason Noise got into an ugly argument with judge Simon Cowell. He then stormed off following the fight.

As if that's not enough, Nick is now left with one spot short after Tom Bleasby, who lost his seat to Ben Clark before swapping with Nathanael Landskroner, pulled out of the show despite finding a place in the top 6.

"I just don't know if I felt vocally ready to take on the competition and the pressure," he was quoted as saying to ITV by the BBC. 

"I'm just going to be exploring different avenues, seeing where I want to take myself musically, maybe try writing a few songs - see what happens. This isn't the end, it's just a new beginning. It just wasn't right for me at this time," he added.

So, who will take Tom's place? There is a social media campaign doing the rounds to bring back Ollie Marland to the show but it is not known who Nick will choose.

Five contestants who have made it to the Judges' Houses are Simon Lynch, Seann Miley Moore, Josh Daniels, Ben Clark and Che Chesterman.

Meanwhile, contestants from Nick's team who were sent home on Sunday were Brodie Kelly, Tom Davies, Jordan Luke Gage, Danny Sharples, Mason Noise, Martin Harich, Jamie Eldridge, Papasidero, Nathanael Landskroner, and Ollie Marland.

Seven out of 16 acts from Cheryl Fernandez-Versini's Groups were performed on Sunday. Decibellas was sent home but the fate of the other acts -- Menn on Point, Alien, Rumour Has It, 4th Power, Mon Amie and The First Kings – will be known only when the rest of the acts perform this Sunday.