PLUG -41% today - Here's a similar example to your question yesterday about stock movements (similar to ELTP's recent slide down) and how they can seem extreme at times.
PLUG did an amazing run from $1 in early December to $11 a few days ago. Wow! Now I know why I've been seeing tweets and postings about the PLUG and others in that sector.
Now, I don't specifically know if there was news about it, but after an 1000% move, I'd say that at some point, it needs to reset. That's just too far, too fast. Plus I think a lot of people set stop losses, and the MM's just take those out left and right and it compounds the selling. Just my $.02.
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