you DONT know if Black Rock own any shares anymore .. they are below the 5% threshold and therefore dont need to disclose any selling activity.
If you are basing your trades on the notion that Black Rock have bought in then please re-do your homework. Black Rock very quickly made sure they were below the 5% mark for share ownership of FGE ... read into that what you will.
btw I have never shorted FGE .. missed my chance ;-)