Prust should NEVER have been down there in the first place 
- Artyukhin76
Agreed. During a TV timeout, an opposing player has no business being at the other end near the goaltender. I didn't see a spear, but I did see the goaltender skate into the "cup check". I would have given Prust an unsportsmanlike conduct penalty and ended it there.
A few years ago when the Preds and the Ducks were playing each other in the playoffs, Corey Perry did something far more egregious and didn't get anything for it. During a TV timeout, all the skaters went to their benches, except Perry who skated up to Pekka Rinne who was standing in his crease. He slashed upward between the goaltenders legs. Peks just looked at him in disbelief. I was surprised that the refs didn't do anything. I was even more surprised that a brawl didn't ensue. Since it was a TV timeout, I don't think there was video of the incident for the league to revue.
I know of one other time Perry did this, but it was as time ran out in the period.
http://youtu.be/92ckOcyQh1s