My security colleagues, writing on their Plausible Deniability blog, recently took a look at widening spread between Barracuda Networks’ unsolicited bid and Sourcefire’s current stock price. They noted that although Sourcefire shares briefly nosed above the $8.25 bid floated by privately held Barracuda, the shares have basically retreated back to the level they were before Dean Drako came calling in late May. Well, the spread turned into a gulf Monday, as Sourcefire stock dropped a buck to just $5.97, the lowest level since the unsolicited bid surfaced. For any arb out there, we would note that’s a 27% discount to Barracuda’s bid.