Jenson Button says Sergio Perez needs to "calm down" before his "dirty" driving results in "something serious" happening.
In the wake of the Chinese GP, Perez was lambasted by his team boss and told to use his "elbows" and "toughen up."
The Mexican driver took Martin Whitmarsh's words to heart.
Battling with Button on more then one occasion in Bahrain on Sunday, the former Sauber driver gave it his all and then some.
Breaking his front end-plate when he hit the back of Button, Perez's next tussle saw him edged off the track by the British driver.
That, though, did not stop him and he came back for more eventually finishing sixth to Button's tenth.
And although Button rates his new team-mate very highly, the 2009 champ was not impressed with Sunday's showing.
"I was so angry and you have to be careful," Button told the Telegraph. "Being in Formula One for so long, you learn how to control your anger, but you still get close to your limit and it was one of those days.
"I'm not used to driving along a straight and having a team-mate coming alongside me and wiggling his wheels at me, and banging wheels at 300 kilometres an hour.
"That isn't normally the way I go racing. Maybe it's the way we go racing now, but it's not the way I want to. He touched me from behind and he touched me on the side going in a straight line at 300 kilometres an hour. That's dangerous.
"I've had some tough fights in F1, but not quite as dirty as that. Something serious will happen soon, so he has to calm down."