The Liverpudlian fought to a draw against the Malawian at the Echo Arena, and the 'Bomber' admitted that he should have put the contest beyond any doubt before it went to points.
"If I thought it was all on the line in the last round, I would have gone in all guns blazing," he told the Liverpool Echo.
"I could have put myself through the gears a bit more and put my foot on the gas, but you don't risk everything if you think you are winning.
"I chose to have a round off at the wrong time and I'll kick myself forever now because of that."
The stalemate means that the pair are likely to have a rematch of their WBC title eliminator bout.