Barry was more interesting? Just a guess, whether a reasonable one I'll leave you you to decide
Or perhaps Nige was worried they would have a clip from his last speech in the European parliament on in the background
Or perhaps because he would be asked awkward questions about the EU money UKIP MEP's including Nige have been accused of using to pay staffers supposedly working on EU matters but instead were used to manage national campaigns?
Or perhaps because he had spent some time campaigning with Nuttall in Stoke at about the time some shady goings on by the latter about registration of his address on the nomination forms came to light.
Seriously for moment, I have no idea and it would have been interesting to see and hear the exchange between those two, but the last one may be relevant?