The two Frenchman started swinging at one another after a 1,500m race last Friday.
He wanted to go sub-12:50 in the 5000m.
For both runners, the Mediterranean Principality holds a special meaning.
The championships are now held every other year.
Both athletes fielded questions ranging from debut marathons to the secrets of longevity.
Cal Poly SLO grad has taken the track and field world by storm. American 800m specialist Maggie Vessey posted the top time in the world