Update: just three minutes later and the NYSE is "fixed", with BATS revoking self-help. But the mission was achieved: the selling was halted, if only for the time being. * * * When in doubt how to send stocks soaring, or at least halt the selling, the solution is simple: break the market. Moments ago everyone's favorite, venerable exchange, the NYSE, broke as per BATS which just delcared self-help: "BATS Exchange has declared self-help against NYSE Arca per Rule 611 of Regulation NMS. Routing to NYSE Arca has been suspended as of 10:11:59 ET."