England captain Dylan Hartley is sent off six minutes after coming on as Northampton lose to Leinster in the Champions Cup.
Leinster Rugby Union
Leinster move level on points with Pro12 leaders Munster as their pace and power proves too much for the Dragons at the RDS.
Leinster backs coach Girvan Dempsey hopes Ireland fly-half Johnny Sexton will be available for the European Champions Cup game against Northampton.
Scarlets run in five tries to move into the Pro12 top four as they survive a scare from league leaders Leinster.
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Leinster are too strong for Newport Gwent Dragons and move level on points with Pro12 leaders Munster