This is how Billy Vunipola broke his arm

Saracens number eight Billy Vunipola will see a specialist this week to determine the extent of the injury he sustained against the Ospreys on Saturday. The England number eight may be out for a while, after scans confirmed that he had fractured his forearm. The injury occurred as he swung a flailing arm at Rob McCusker, which connected with the Ospreys number eight's head, sending both players to the turf in a lump.  Despite clutching his arm, Vunipola played on and finished the half, taking part in defense as well as making a drive from a lineout. He even helped big Maro Itoje up from the…