For those who aren't wtching, Dumas came int to make a waist high tackle on the players left.
Hilder cam in high on the right.
As Dumas swung around the back, his head cam into contact with Hilders backside, with force. his head was at a very bad angle. A place or way in which a neck should not move.
Not the sort of injury to cause a break, but definitely could cause ligament or disc injuries.