I think we would all agree it can't be known what the market will do. But we can be ready for when it does it. There is no valid technical reason why you would close a long position based on yesterday's Close. Alright, some indicators would be interpreted as saying get out now, but I don't count them as 'valid' for calling tops: for me, the only thing that identifies a top is dropping price. But you might want to tighten your stops based on money / risk management. As long as you recognise that getting out here is not based on TA and that the next time the charts look like this, you would not be able to rely on the evidence / performance of the current TA as guidance then.