Ann: Trading Halt, page-23

To answer the first part, it could also be the case that Credit Suisse was accumulating in the lead up to the announcement, without being able to cap the price much given how thinly traded the stock is.

They won't care about the extra 5-10% that they had to pony up, as long as they can make more than that by lending the shares out to their clients on the short side of the register, who will probably make a killing if the news is indeed bad.

Of course, as a holder, I hope it is nothing of the kind, but the big investment banks are known to indulge in stuff like this (UBS being the most prominent actor in our market).