Spoiler Alert: The story includes details about Episode 815 of ABC’s 9-1-1, “Lab Rats.“

On a typical 9-1-1 episode, this would’ve been a centerpiece — a chase involving three helicopters around Downtown Los Angeles skyscrapers that ends with a landing on the field of the L.A. Coliseum.

But the April 17 episode of ABC’s firefighter drama, “Lab Rats,” was anything but typical, marking the exit of star and executive producer Peter Krause. So the impressive stunt was overshadowed by Station 118 Captain Bobby Nash (Krause) dying just minutes later at an underground lab where a fire had triggered the release of a deadly virus.

The aerial pursuit involved 118’s Buck (Oliver Stark) and his ex Tommy (Lou Ferrigno Jr.) leading two military choppers on a decoy mission while Athena (Angela Bassett) rushed to deliver a vial of anti-viral to Bobby’s team, one of whom, Chimney (Kenneth Choi), had gotten infected.