Is that pump you were thinking about was the thing that somewhat happened to Steem blockchain before? Before I entered the steem blockchain before, the exchange value was higher. But over the months, it slowly started detoriating until it droped from a dollar. - if I remember that correctly.
... were you kind of speaking the same situation?
There have been a number of likely pumps of Steem dollars (SBD) in the past, because the coin has low liquidity and the conversion mechanism to Steem set a floor value on its price. So, yes, I think something similar was attempted with Hive dollars (HBD), likely by the same people (price action for HBD originated from the same place as prior pumps of SBD).