The underwriter won't be sweating- they'd get fees and charges to well match any loss of share price. They'll sleep well at night. They may even have upside from their investment now, later down the track.
You'd have to say raising $317m for a purchase,and adding debt, is a "company maker" for MRM. Can it integrate the new purchase well, or will there be teething problems that become structural problems or cultural fit issues?