Taken from the OnG book....
However, if a unit moves into contact with a Ricochet model, it immediately (before completing the move) suffers X+D6 hits, and the model with Ricochet is removed as a casualty. This is not triggered by moves that can move through units normally (e.g. Flying Movement), unless the move is ended in contact (note that units can move into contact with multiple Ricochet models simultaneously).
Note the part in bold. A Sweeping Attack is a special “ranged” attack, that is performed. Being that it is ranged, there is no “contact” of units.
Great reply! Thank you, I don't know how we missed that!The covenant shall bind you...