What you're seeing is the effect of an immature and small market. The stabilizer along with the natural incentives of the blockchain ensure that HBD will return to peg "soon" after these sorts of disruptions. In a more mature market there would be more traders competing to take advantage of the opportunity for a few percent return over a few days (realistically you shouldn't make more than a small fraction of a percent in a few days on a low risk trade), and this would keep these deviations small and short.

Fortunately the stabilizer has a dual purpose. It pushes the price back toward the peg but it also generates profit from DHF and in the course of doing so produces net buying pressure for HIVE. The more and bigger the deviations, the bigger the profit. So Hive stakeholders benefit either way.