Quote from Lespaulr0cker:
Algo stop run targeting all the stop orders held by the shorts who got trap reversed in the RTH.
maybe it was a stop run afterall. Some BSD finding it easy to run stops in AH and selling at a good price, so market opens down and he can cover 8-10 points down 5000 contracts. Very interesting strategy - if it is what that BSD has tried to do.
I haven't really looked at spikes in AH session on ES, but I feel motivated to take a closer look on it now.
