piers will just talk over him. going on piers show is a lose lose situation since its his show and they run it their way.
That's why I recommend using your command voice to say "I'm sorry, I wasn't finished yet," and continue in your command voice.
With Morgan, and incidentally Rosie O'Donnel among others, I have seen him/them using this "interruption technique" on interviewees far too many times.
'Course, The Gunny (R. Lee Ermey) would change it to "Shut your <scatological reference>-filled piehole, you worthless womanly <procreational reference> wormbait, when your DI is talking AT you!"


Terrible Terry The Indomitable, 230RN
(Pic credit in properties)