Huge spiker today. Trying to buy a dip buy here at just below $17. I saw earlier but didn't try as kept getting interrupted. Got up to $18.50 area. Try to put sell in and immediately dropped to ow $17 so decided I want out before weekend. Then slowly moved back over $18 close to close but I'm out too risky for me now. Has now dropped after hours to $14 area. Hence why you sell on fast spikers.