In Dante Lam’s That Demon Within, now in limited North American theatrical release, a tightly-wound police constable (Daniel Wu) loses his already tenuous grip on reality after donating blood to a stabbing victim. The beneficiary of this reflexive act of altruism turns out to be the Demon King, cop-killer and leader of a ruthless armed robbery ring. The intensity of Wu’s internalized madness places him alongside Keitel and Cage in the cinematic cop-on-the-edge hall of fame. Nick Cheung, previously seen as the soulful MMA trainer in Lam’s rousing fight pic Unbeatable, vibrates with grinning menace as the Demon King. Lam’s oppressive, wildly expressionistic direction situates the audience inside the protagonist’s skewed reality, even as it keeps up the cat-and-mouse crime thriller tension. As such it recalls the director’s previous portrayal of a policeman’s spiral into insanity, the classic Beast Cop.Cinematographer Kenny Tse again shows that Hong Kong is the world city that was made to be photographed in beautiful digital.
Lam knows how to escalate a third act, and here serves up an outer conflagration to match it’s anti-hero’s inner disintegration.
A must-see for fans of Feng Shui, gritty crime flicks, and hallucinatory cinema.
HK movies now routinely show up on streaming services, so if you can’t catch it now, remember That Demon Within for later.
In the 
If you watch action movies for the storylines, you will find much to deride in Special ID. If on the other hand you want to see Donnie Yen direct some inventively punishing martial arts sequences, you can now catch it in a limited theatrical release in North America, or grab it on iTunes. Yen plays an undercover cop caught between his triad boss (Collin Chou) and his triad protégé (Andy On.) At one point the case takes him to the mainland where he meets a winsome/comically strident female counterpart (Tian Jing.) Other than that it's, shall we say, loosely plotted. But what you’re there for is the action--particularly the climactic car chase/martial arts battle which is possibly the best combo of those two elements you could hope to see. 
Right now I am working on Feng Shui schticks specific to the foes the heroes fight. (The new edition abandons the PC/NPC symmetry of the original.) Inventing crunchy bits is a job of fits and starts, ideal for idle thinking while running errands. But without a way of quickly noting an idea, it vanishes. Dictating rules bits into the phone does, however, have its perils.
A teaser from the first draft manuscript for Feng Shui 2, in the form of a new Sorcery ability: