Because people are impatient and if they don't get news from the company every week they think something is going wrong with the trials. I personally think Leo has some people spoiled with all the updates. This is a long term hold kind of stock. Either the drugs work or they don't. If they do the stock holders get rich, if they don't we lose all our money. Good thing we have two chances with Prorisol and Kevetrin.
It was a low volume walk down by the market makers until stops were triggered at 1.50
Most of the volume was below this obvious stop level, then gap right back up. Some retail fear selling, then gap up again to close up a penny.
Classic Bear Raid hunting for stop orders. Market makers make a quick buck. Nothing changed in the fundamentals.