The barbed strangler is NOT an ordnance weapon. It's just a blast weapon which uses the big blast marker.
The barbed strangler is classified as "Assault 1/Ord. Blast"
Real ordnance weapons are "Ordnance 1/Blast"
You roll to hit as normal, place the blast marker, and the opponent may move it with the usual rules, exactly as you would do with a frag missile or plasma cannon (except that you may fire it on the move).
Ordnance and guess weapons don't need a to hit roll. The scatter dice simulate the chance to miss.
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