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While it might be true there is a long build in Blood Beat, I think the films strengths actually lie in the more dormant places. The mysterious dynamics between these characters, all these weird random plot threads that seem to swirl around eachother while barely touching, drew me right in from the beginning. Add to this the fact that it has a great sense of place (RLM touches on this in their review, how it really seems to understand the kind of lives that exist in such barren and lonely and somewhat depressing places like Wisconsin) and the alien quality of some of the actors, gives it a lot of flavor. It is part of the charm of these regional, low-budget horror films. They all have a very specific, hard to explain quality tied to their locale.
Even if these padded scenes were terrible though, those peak moments of action in this are so good they would still carry the movie. At least 25 minutes of this 80 minute film are completely bonkers. That's an impressive ratio when talking about some movie that has virtually no cult following whatsoever.
I think the movie is legitimately very good (with no need to tie this to comparisons to other low budget nonsense). It's possibly my favorite first time watch horror I've seen this whole year (unless we are counting Messiah of Evil's clean new print, which was almost like watching a completely new movie)