This also happened with EGO, it was quiet for ages (held in the 0.005 to 0.008 trading bandwidth) then rocketed on the ASX red days during the August shakeout.
In fact much like MHL today in the way that rogues has alluded to. In short, they're ambush tactics hoping the market players in general are distracted with other events in the broader market. Get set for a big run sooner rather then later...