Patrick Fabian says things come to a head in episode four: "Jimmy starts to get under Hamlin's skin in a big way."

Jimmy (Bob Odenkirk) is poised to take things too far in Monday's Better Call Saul.

So far, he's done his best to antagonize his brother Chuck's (Michael McKean) law partner Howard (Patrick Fabian), bursting into his conference room in episode one and demanding he pay Chuck millions.

See more 'Better Call Saul': See 'Breaking Bad' Easter Eggs You Missed

The unflappable white collar attorney has kept his cool, but that is about to change, says Fabian.

"Jimmy starts to get under Hamlin's skin in a big way," Fabian tells The Hollywood Reporter. "Jimmy referred to Hamlin as Lord Vader in episode one. And we're not really sure why, and I think we begin to see why they're going to be frenemies at best in this episode."

Fabian says Howard puts up with Jimmy's outbursts out of respect for Chuck, who is a valued member of Hamlin, Hamlin & McGill. But there is only so far he'll let Jimmy push him.

"There is also a business to be had, and lines that cannot be crossed. In episode four, Jimmy starts to cross those lines," says Fabian."

See more 'Breaking Bad': 25 Most Badass Quotes

Despite Jimmy's haranguing, Howard hasn't done much to lead the audience to thing he's as bad as the show's protagonist would have viewers believe.

"We don't want to do any sort of mustache twirling," Fabian says of co-creators Vince Gilligan and Peter Gould's vision for the character. "Howard is someone who does not want to rock the boat. He likes soft power. He likes to use his rolodex and handshakes and country club golf course deals."

For a real-life touchstone to the character, Fabian describes Hamlin as "a Mitt Romney type, but maybe not as far to the right, and maybe more aware of what he says."

Stay tuned to The Live Feed following Monday's episode for spoiler-filled full post-mortems with Fabian, Julie Ann Emery (Betsy Kettleman), and writer Gennifer Hutchison.

Better Call Saul airs at 10 p.m. Mondays on AMC.

Email: Aaron.Couch@THR.com

Twitter: @AaronCouch