Lucky Strike said...
"Am I to assume that the poundage has to be high enough that one can't hold at draw for more than 2 sconds or so in order to have the string automatically rip loose?"
No, it has nothing to do with draw wt, but is part of the "trust your bow arm" thing as it becomes INSTINCTIVE or an "unconscious release" when your brain tells your hand to release the string because the bow arm is pointed at the target. The release just "happens" unconsciously, kind of like "being in the zone" and unlike consciously pulling a trigger to shoot.