Does the Bell toll for Unionist unity in Belfast?

A bit of a surprise announcement tonight from the DUP

Bell who represents the Strangford constituency has been nominated to either focus the UUPs mind that time is really running out or have they possibly made the calculation that they might be able to unseat McDonnell without a unity candidate?

Regardless the response from the UUP was swift

We note that in trying to justify his selection of Jonathan Bell MLA as the DUP candidate for South Belfast in May’s General Election, Peter Robinson claimed it was because the Ulster Unionist Party had already selected a candidate for the constituency. For the record, and as he well knows, this is not true

End of unionist unity for 2015?