Personality & Characteristics
Barthez was just as strict as Boris when it came to discipline, which made Aaron, Claude, Mathilda and Miguel fear him. He wanted to win by cheating, and any of his team's members who disrespected him or refused to obey his orders was eventually punished; he did not hesitate to punch both Mathilda and Miguel when all of them were in their team's locker room.
Barthez was a lot more frustrated by Miguel's behavior since he openly rebelled and made the first moves while the other team members only occasionally supported him. Barthez once grabbed the blader by his shirt, after hitting him, and shoved him forward so his back hit the wall. Of course, Barthez did not do this publicly; he instead put up some kind of 'loving father' mask, except when he was giving orders during beybattles.
In general, Barthez stopped Miguel and his teammates from developing their true talents in Beyblading. For that, the team got tired of it altogether and officially fired him as their coach in order to blossom on their own.
Barthez is later revealed by Tala to have taken commands from Boris Balkov. The two evil men had one common goal: take over the world. However, this was a more discreet move from Boris, since nobody suspected Barthez.