I think the key to remember is, when there's no developments, on a normal day the volume is VERY low, strongly suggesting that practically all s/h's are waiting for higher levels. Shorts are smart and know that some people get impatient and frustrated, and can be tested to sell at a loss.
It's also not uncommon in the market for two brokers to trade shares in between themselves, or for one trader to flip between to accounts, to give the impression of volume.
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