“On Swift Horses” is an adaptation of a 2019 novel by author Shannon Pufahl, and it doesn’t seem like an easy book to bring to the big screen. There’s a tangle of characters to follow, with most in possession of dual lives, aching to achieve a bit of clarity in impossibly clouded living situations. There’s addiction and danger, along with plenty of forbidden attraction, putting screenwriter Bryce Kass to work managing a lot of complicated feelings and detours. Director Daniel Minahan (a television vet) attempts to make some cinematic poetry out of the tale, and while the feature is carefully crafted, it’s not particularly gripping, even with so much going on. “On Swift Horses” slowly goes about its business, picking up on feelings and desires, but it also remains frustratingly flat, as the helmer can’t tap into passions that drive these personalities, forgoing intensity to make something contemplative, but there’s just not all that much to consider. Read the rest at Blu-ray.com