Maybe they had to, the buyers of the converts will need the prices above $1.38 to lay out their hedges...Frankly, in few months this might look like an excellent deal, after all, it not a floorless, it is even at a premium to market.
The selloff was probably to drive the price down enough to make the convert price look decent, rather than what it is, which is an almost sure-thing opportunity for the convert buyers to make money by shorting above $1.35.
It does seem like very good news for the company, though...