Condition field of T&S

[ahhaha]

Can anyone explain the entry in the "condition" field that reads, B(Short sale), A(Short sale)?

This is occurring, for example, in BIDU today, where the spread is 4 cents, bid 114.20, ask 114.24.

Obviously, it must mean there's a limit order to go short on the bid and the ask, but that makes no sense. How can a matching order to sell long be paired with a sell short? There's a secret invisible party that gets on the other side of both?

[gringo28]

am seeing the same thing in CLF today on heavy short interest over the last two months and a disaster of an earnings report this week. would love to have Esignal explain it but my sense, after watching today, is this is a buy to close order. they're running it up into the close and the frequency of the field is much less whereas during the day today as they walked it down, there were many mentions of this in the condition field.