why the abnormal sell off. of HZR.

I note the question being asked on Twitter and it has been asked on this thread as well.
@Michaeljob post 32444650
Posted Broker  Data  that hilites what is happening.
Total shares traded in this period  was    7,168,540
total shares traded on the ASX    was    4,851,289
  shares traded off market 2,317,251 (or within the brokers own platform)
this is a ratio   close  to 2 on market  1 off market
  The overall ratio for( all shares)  the ASX   ( given as individual totals on the report )
   on 4.403 billion off 1.359 billion  a ratio of better than 3 on market  to 1 off market.
this tells me  there is an abnormal amount of  HZR off market trading.... Unhealthy.

In relation to the broker where all the action is...........it follows BOTS are part of the trading platform  offered  here. check out D2MX  Broker

Internet bot - Wikipedia

https://en.wikipedia.org/wiki/Internet_bot

An Internet Bot, also known as web robot, WWW robot or simplybot, is a software application that runs automated tasks (scripts) over the Internet.

all IMO