Of course Ellers fought back and didn't turtle. I'm not sure there are many people when getting punched in the head that would just sit there and take it without trying to defend themselves.
Celebrations and taunting are apart of all sports. Should a player be jumped every time...heck no. As Bagwell, mentioned what if Ellers (who didn't want to fight) got knocked out cold fell back and bashed his head against the ice causing him to have concussion symptoms for the rest of his life....maybe that is the extreme but it could happen....all because someones feelings were hurt because they got taunted being down 7-0.