Rage heads don't require as much KE as MOST mechanical heads. Just think about it, the blades slide backwards in the Rage heads as apposed to other mechanicals "Folding" back, like a Spitfire for example. The Snypers, are basically a Rage head, same design really. Just a few small differences. If this gives you any idea, on one of the Dream Season episodes a guy got a complete pass through with his recurve, using a Rage head. That's slower than 200fps generally. Not saying your wrong and not trying to protect Rage heads, but I think their design is pretty clever, and does in fact not take as much KE to open because of how the blades operate.