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Looks like they're trying to separate an ejection mechanism derived from an explosive event from one that is purely gravitational, as it would be where a binary system was upset by a close encounter with the supermassive hole in Sag A*.
A quark star or neutron star would be ejected from a supernova explosion in exactly the same way, unless there was some weird reaction between the formation of the quark star and the surrounding debris from the explosion (or the explosion itself).
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