Bob Odenkirk's recent health scare was 'incredibly frightening,' says former costar Mark Proksch

• Mark Proksch shared his thoughts on Bob Odenkirk's health scare in a recent interview with Insider.
• "It was incredibly frightening," the "What We Do in the Shadows" star revealed.
• Proksch called his former costar a "mentor" and said he was lucky to also call Odenkirk his friend.

"What We Do in the Shadows" star Mark Proksch opened up about his reaction to Bob Odenkirk's recent health scare in a new interview with Insider.

"It was incredibly frightening," Proksch said of Odenkirk collapsing on the set of "Better Call Saul" in late July. "He's a mentor and he's a hero of mine, and insanely enough, I get to call him a friend."

Proksch told Insider that he reached out to the Odenkirk family (Odenkirk's wife Naomi is also Proksch's manager) immediately after the "Breaking Bad" star was hospitalized.

"It's scary, and he's an incredibly energetic person who is always on the go," Proksch, who had a recurring role as Daniel Wormwald on "Better Call Saul," said.

"When something like that happens, it really shakes you to your core," he added.

News first broke July 28 that Odenkirk had collapsed while filming "Better Call Saul" in New Mexico. He was then rushed to the hospital, and revealed on Twitter a few days later that he'd had a "small heart attack."

On August 7, Odenkirk tweeted that he'd had his own "It's A Wonderful Life" experience with people "insisting" that he "makes the world slightly better."

And on Thursday, the actor shared an image of him getting his makeup done on set, revealing that he was back working on "Better Call Saul."

"So happy to be here and living this specific life surrounded by such good people," Odenkirk wrote.