I finished my Johnnie To mini-festival with this one, which can be described in shorthand as Backdraft in HK. The thing is, I really hated Backdraft (2/10 ... don't even remember why, and it should get points for providing the soundtrack to the original Japanese Iron Chef).
The first hour of Lifeline presents us with the firefighters who will feature in the story. It's done well enough, I suppose ... some of the characters are interesting. And there are some brief firefighting scenes interspersed with the melodrama. But I was impatient ... this kind of character "development" usually bores me, since it is often shallow, and merely postpones the good stuff.
In fairness, the good stuff, when it finally arrived, was improved by our knowing the various characters, so I should probably leave well enough alone.
Because the good stuff is phenomenal. The last 40 minutes are gripping, like watching one of the better Mad Max movies, only with fire instead of cars. A large building is on fire, and it's one thing after another. The firefighters never get ahead of the game, and even when they stall the fire momentarily, another crisis arises. It's like an alien monster invasion movie, where everything the army tries against the aliens fails, and hope fades to nothingness. I don't know who deserves credit for the excellence here, so I'll just name some of the likely suspects: director Johnnie To, of course; cinematographer Cheng Siu-Keung; editor Wong Wing-Ming; and action director Yuen Bun. The music by Raymond Wong adds a lot, as well. There's no point in breaking down the various segments of the fire scene. Just know that you likely will never see any similar scene that matches this one.
Lau Ching-Wan is excellent in the lead role, and everyone else is good enough. It takes a bit of patience to get through the first hour, but that patience is rewarded when the real action starts. 7/10.