Ork Roks verse Tyranids OP

Just played skimish and destroyed 2x hive ships in a few seconds by ramming with 2 roks. They just totally came apart and one even went off the top of the screen in the 3rd dimension. Orks did take plenty of crew damaged but quick borading actions and the roks were repopulated to ram the next hive ship.

Got your answer then chief