Typical Ryanair behaviour. They did it at Luton the other year, drove easyJet off the Copenhagen route. The battle was quite intense so much so that Copenhagen was one of Luton's busiest routes in terms of rotations and pax but after easyJet pulled off the route Ryanair decreased it x1 daily and now the route doesn't operate whatsoever.
Strange behaviour. It's almost like they just relish the battle.