I thought it was about their split, their attitudes towards one another and how they've changed now they're back together; all five of them, that is. I assume the 'flood' was the emotions they wanted to express to each other, but they held them back due to the stubborn nature of some of the band members. It was Robbie that supposedly caused the biggest rift between them, and as he's now part of the group again, they don't need to hold back the 'flood' any more. Just my interpretation!
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