PhD student studying extant and fossil birds. Alternatively, parvicursorine or near parvicursorine alvarezsaurid described by Longrich & Currie (2009).
Related to Mark Witton's recent blogpost:
About the idea of dromeosaurs not being capable of extended pursuit due to their less cursorial leg proportions compared to specialized runners, isn't this something far more related to aerobic capacity than leg anatomy? Sure, they weren't the fastest predators, but with the theropod respiratory system they likely still had decent endurance, similarly to mustelids (non-cursorial animals that are still capable of extended movements at speed).
It should also be noted that there are a few dromeosaur trackways that show these animals covering ground-not running, simply travelling-at a similar pace to animals known for good stamina such as wolverines or large canids (Kim et al. 2008; Li et al. 2007; Murdoch et al. 2010).
For some of the incredibly robust taxa like Utahraptor extended pursuit might not be feasible, but it may have been a thing for more generalized eudromaeosaurs (albeit not at speeds similar to true cursorial specialists and not as their main hunting behaviour)