"It's the style of fighter that he is that he leads with his head. If I told him once, I told him 20 times, 'I don't want his head near your head."'
But Parker was in his own world, spurred on by claims he couldn't mix it with a real puncher and threw the game plan out the window.
"The reason I got the cut is because I didn't follow the plan," Parker said. "I did this to myself.
"In future fights I can't let emotions get in the way. People had been saying that they weren't sure if I could take a punch or not and emotions took over and we just started brawling. I just thought, 'If you want to brawl, let's brawl."'
Barry will now fly Parker to see a specialist surgeon in Las Vegas who he hopes can help with the healing after 14 stitches were applied last night. "Doctor Dave did an amazing job last night, we were so lucky we had a real fight doctor there," Barry said.
"I have seen too many fighters' repair work ruin their careers where doctors have stitched them up after the fight only for it to be substandard and every fight after that they're opening up again."
But the lingering threat of what this deep gash could do to Parker's career is likely to give Barry and Duco at least a few sleepless nights.
"I don't know what's going to happen the next time he's in a fight and gets hit really hard in the same spot," Barry said.