Sources say the new dad was really grumpy on set before his baby was born in the middle of the season, and producers were niggling at him and pushing him to snap to create good TV.
'But Sticks wasn't having a bar of it and it got pretty tense,' says the source. 'He doesn't have a fake bone in his body and refused to do anything just because it will look good on screen.'
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This article originally appeared on New Idea.