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Arms into wings

<Why would it reduce prey capture? Bats use their wings to capture
bugs-it makes a dandy scoop that funnels everything small to the mouth.>

I'm not sure bats are a good analog, since they evolved from quadrapedal   
insectivores whose forearms, if you look at insectivores today anyway,   
had more to do with walking, running and climbing than killing prey.  It   
doesn't appear that ancestors of Chiroptera would have sacrificed much   
prey capturing ability by evolving flight. Their wings were more likely   
exapted for that purpose after flight evolved. Cursorial dinosaurs, on   
the other hand, lost (or at least diminished the utility of) a very   
effective set of prey capture tools when they transformed their arms to